我正在使用以下代码打印双列参考书目。但是，如下图所示，存在偏移。我该如何修复代码，使左列向上移动并像右列一样正确开始？
以下是可以运行但最简单的代码示例：
前言：
\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{dissertation}[2013/07/08 v1.0 TU Delft dissertation class]
\newif\if@nativefonts
\DeclareOption{nativefonts}{\@nativefontstrue}
\newif\if@print
\DeclareOption{print}{\@printtrue}
\DeclareOption*{\PassOptionsToClass{\CurrentOption}{book}}
\ProcessOptions\relax
\LoadClass[10pt]{book}
\RequirePackage{amsmath}
\RequirePackage{amssymb}
%% English is the default language, but Dutch is used for some sections.
\RequirePackage[dutch,english]{babel}
\RequirePackage{calc}
\RequirePackage[nooneline,footnotesize]{caption}
\RequirePackage{chapterbib}
\RequirePackage{etaremune}
\RequirePackage{fancyhdr}
\RequirePackage{siunitx}
\RequirePackage{graphicx}
\RequirePackage[flushmargin,hang]{footmisc}
\RequirePackage{ifpdf}
\RequirePackage{ifxetex}
\RequirePackage{gensymb}
%\DeclareUnicodeCharacter{00A0}{~}
\usepackage{wrapfig}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{lscape}
\usepackage{xkeyval,float}
\usepackage[export]{adjustbox}
\usepackage{multicol}
%\usepackage{floatrow}
\usepackage{setspace}
\ifxetex
\RequirePackage[xetex]{geometry}
%%\RequirePackage[xetex]{graphicx}
\RequirePackage[xetex]{hyperref}
\RequirePackage{fontspec}
\RequirePackage{xltxtra}
\defaultfontfeatures{Ligatures=TeX}
\else
\ifpdf
\RequirePackage[pdftex]{geometry}
%% \RequirePackage[pdftex]{graphicx}
\RequirePackage[pdftex]{hyperref}
\else
\RequirePackage[dvips]{geometry}
%%\RequirePackage[dvips]{graphicx}
\RequirePackage[hypertex]{hyperref}
\fi
\RequirePackage[T1]{fontenc}
\RequirePackage[utf8]{inputenc}
\fi
\RequirePackage{lettrine}
\RequirePackage{metalogo}
\RequirePackage[sectionbib,numbers,sort&compress]{natbib}
\RequirePackage{tikz}
\RequirePackage[noindentafter]{titlesec}
\RequirePackage{titletoc}
\RequirePackage[nottoc]{tocbibind}
\RequirePackage{xcolor}
%% If the document is not compiled with XeLaTeX, we need to use the native
%% fonts.
\ifxetex\else
\@nativefontstrue
\fi
\if@nativefonts
%% The native font is Utopia Regular with Fourier math. We use Latin Modern
%% as a fallback, since Utopia lacks support for sans-serif and monospace.
\RequirePackage[T1]{fontenc}
\RequirePackage[utf8]{inputenc}
\RequirePackage{lmodern}
\RequirePackage{fourier}
%% The style for titles is small caps.
\def\titlefont{\rmfamily}
\def\titleshape{\scshape}
\def\titlestyle{\titlefont\titleshape\bfseries}
\if@print
\def\headerstyle{\titlefont\titleshape\bfseries}
\else
\def\headerstyle{\titlefont\titleshape}
\fi
\else
%% The TU Delft house style fonts are Bookman Old Style (serif) for titles
%% and Tahoma (sans-serif) for text. Apart from these, we use Courier New
%% for monospace and Cambria for math.
\RequirePackage{unicode-math}
\setmainfont[
Path = fonts/,
Extension = .ttf,
BoldFont = *-Bold,
ItalicFont = *-Italic,
BoldItalicFont = *-BoldItalic
]{BookmanOldStyle}
\setsansfont[
Path = fonts/,
Extension = .ttf,
BoldFont = *-Bold,
ItalicFont = *,
ItalicFeatures = FakeSlant,
BoldItalicFont = *-Bold,
BoldItalicFeatures = FakeSlant
]{Tahoma}
\setmonofont[
Path = fonts/,
Extension = .ttf,
UprightFont = *MT,
BoldFont = *-BoldMT,
ItalicFont = *-ItalicMT,
BoldItalicFont = *-BoldItalicMT
]{CourierNewPS}
\setmathfont[
Path = fonts/,
Extension = .ttf
]{CambriaMath}
%% The default style for text is Tahoma (sans-serif).
\renewcommand*\familydefault{\sfdefault}
%% The default style for titles is Bookman Old Style (serif).
\def\titlefont{\rmfamily}
\def\titleshape{}
\if@print
\def\titlestyle{\titlefont\titleshape\bfseries}
\else
\def\titlestyle{\titlefont\titleshape}
\fi
\def\headerstyle{\titlestyle}
\fi
%% Define the TU Delft house style colors.
\definecolor{tudelft-cyan}{cmyk}{1,0,0,0}
\definecolor{tudelft-black}{cmyk}{0,0,0,1}
\definecolor{tudelft-white}{cmyk}{0,0,0,0}
\definecolor{tudelft-sea-green}{cmyk}{0.54,0,0.32,0}
\definecolor{tudelft-green}{cmyk}{1,0.15,0.4,0}
\definecolor{tudelft-dark-blue}{cmyk}{1,0.66,0,0.4}
\definecolor{tudelft-purple}{cmyk}{0.98,1,0,0.35}
\definecolor{tudelft-turquoise}{cmyk}{0.82,0,0.21,0.08}
\definecolor{tudelft-sky-blue}{cmyk}{0.45,0,0.06,0.06}
\definecolor{tudelft-lavendel}{cmyk}{0.45,0.2,0,0.07}
\definecolor{tudelft-orange}{cmyk}{0.02,0.56,0.84,0}
\definecolor{tudelft-warm-purple}{cmyk}{0.58,1,0,0.02}
\definecolor{tudelft-fuchsia}{cmyk}{0.19,1,0,0.19}
\definecolor{tudelft-bright-green}{cmyk}{0.36,0,1,0}
\definecolor{tudelft-yellow}{cmyk}{0.02,0,0.54,0}
%% Use TU Delft cyan as the color for titles, unless the 'print' option is
%% specified, in which case we use anthracite, a dark gray, which is also used
%% for the thumb indices.
\definecolor{anthracite}{cmyk}{0,0,0,0.8}
\if@print
\colorlet{title}{anthracite}
\else
\colorlet{title}{tudelft-cyan}
%\colorlet{title}{tudelft-cyan}
\fi
\colorlet{thumb}{anthracite}
%% Set the paper size to 17 by 24 cm, approximately halfway between A4 and A5.
\if@print
%% In print mode we add a 3 mm bleed on the outside of the page.
\geometry{
papersize = {173mm,246mm},
layoutsize = {167mm,240mm},
layoutoffset = {3mm,3mm},
bindingoffset = -3mm
}
\else
\geometry{papersize={170mm,240mm}}
\fi
%% We decrease the margins slightly from the default (scale = 0.7).
\geometry{hscale=0.75,vscale=0.8}
%% Redefine the title command to accept an optional subtitle.
\renewcommand*\title[2][]{%
\def\@subtitle{#1}%
\def\@title{#2}%
%% Add the title to the PDF meta data.
\hypersetup{pdftitle=#2}%
}
%% Redefine the author command to accept a first and last name, and to add the
%% full name to the PDF meta data.
\renewcommand*\author[2]{%
\def\@firstname{#1}%
\def\@lastname{#2}%
\hypersetup{pdfauthor=#1\ #2}%
}
%% Remove the header and page number on empty pages.
\def\cleardoublepage{%
\clearpage%
\if@twoside%
\ifodd\c@page%
\else%
\thispagestyle{empty}%
\vspace*{\fill}%
\newpage%
\fi%
\fi%
}
\if@print%
\newcommand*\cropmarks{%
\ifodd\c@page%
\begin{tikzpicture}[remember picture,overlay]
\draw ($(current page.north east)+(0mm,-3mm)$) -- ($(current page.north east)+(-2mm,-3mm)$);
\draw ($(current page.north east)+(-3mm,0mm)$) -- ($(current page.north east)+(-3mm,-2mm)$);
\draw ($(current page.south east)+(0mm,3mm)$) -- ($(current page.south east)+(-2mm,3mm)$);
\draw ($(current page.south east)+(-3mm,0mm)$) -- ($(current page.south east)+(-3mm,2mm)$);
\end{tikzpicture}%
\else%
\begin{tikzpicture}[remember picture,overlay]
\draw ($(current page.north west)+(0mm,-3mm)$) -- ($(current page.north west)+(2mm,-3mm)$);
\draw ($(current page.north west)+(3mm,0mm)$) -- ($(current page.north west)+(3mm,-2mm)$);
\draw ($(current page.south west)+(0mm,3mm)$) -- ($(current page.south west)+(2mm,3mm)$);
\draw ($(current page.south west)+(3mm,0mm)$) -- ($(current page.south west)+(3mm,2mm)$);
\end{tikzpicture}%
\fi%
}
\else
\newcommand*\cropmarks{}
\fi%
%%% Thumb indices consist of white text on a rectangular colored background. The
%%% font-size is 75% of the size of thumb height.
\newif\ifthumb
\newlength\thumbheight
\setlength\thumbheight{24pt}
\newlength\thumbedge
\setlength\thumbedge{4pt}
\newlength\thumbhspace
\setlength\thumbhspace{36pt}
\newlength\thumbvspace
\setlength\thumbvspace{2\thumbheight}
\newlength\thumbwidth
\setlength\thumbwidth{36pt}
\newlength\thumbspacing
\setlength\thumbspacing{2\thumbheight}
%% We need the TikZ library calc to calculate the coordinates of the thumb
%% indices.
\usetikzlibrary{calc}
%% The lthumb command prints the current chapter number in a thumb index on the
%% left (even) page.
\newcommand*\lthumb{%
\ifthumb%
\begin{tikzpicture}[remember picture,overlay]
\coordinate (top margin) at (0pt,1in+\topmargin+\headheight+\headsep);
\coordinate (left margin) at (1in+\evensidemargin,0pt);
%% Calculate the corners of the thumb index based on the current
%% chapter number.
\coordinate (top left) at ($(current page.north west)-(top margin)-(0pt,\value{chapter}\thumbvspace-\thumbvspace)$);
\coordinate (bottom right) at ($(top left)+(left margin)-(\thumbhspace,\thumbheight)$);
%% Shift the left edge to prevent the rounded corner from showing.
\coordinate (top left) at ($(top left)-(\thumbedge,0pt)$);
%% Draw the thumb index.
\fill[fill=thumb,rounded corners=\thumbedge](top left) rectangle (bottom right);
%% Print the chapter number at the center right in the thumb index.
\coordinate (center right) at ($(bottom right)+(0pt,0.5\thumbheight)$);
\node at (center right)[anchor=east,inner sep=2\thumbedge]{
\titlefont\bfseries\color{tudelft-white}
\fontsize{0.75\thumbheight}{0.75\thumbheight}\selectfont
\thechapter
};
\end{tikzpicture}%
\fi%
}
%% rthumb draws a thumb index on the right (odd) page.
\newcommand*\rthumb{%
\ifthumb%
\begin{tikzpicture}[remember picture,overlay]
\coordinate (top margin) at (0pt,1in+\topmargin+\headheight+\headsep);
\coordinate (right margin) at (1in+\evensidemargin,0pt);
%% Calculate the corners of the thumb index based on the current
%% chapter number.
\coordinate (top right) at ($(current page.north east)-(top margin)-(0pt,\value{chapter}\thumbvspace-\thumbvspace)$);
\coordinate (bottom left) at ($(top right)-(right margin)-(-\thumbhspace,\thumbheight)$);
%% Shift the left right to prevent the rounded corner from showing.
\coordinate (top right) at ($(top right)+(\thumbedge,0pt)$);
%% Draw the thumb index.
\fill[fill=thumb,rounded corners=\thumbedge](top right) rectangle (bottom left);
%% Print the chapter number at the center right in the thumb index.
\coordinate (center left) at ($(bottom left)+(0pt,0.5\thumbheight)$);
\node at (center left)[anchor=west,inner sep=2\thumbedge]{
\titlefont\bfseries\color{tudelft-white}
\fontsize{0.75\thumbheight}{0.75\thumbheight}\selectfont
\thechapter
};
\end{tikzpicture}%
\fi%
}
%% Page style for empty pages.
\fancypagestyle{empty}{%
\fancyhf{}
\renewcommand*\headrulewidth{0pt}
\renewcommand*\footrulewidth{0pt}
\fancyhead{\cropmarks}
}
%% Page style for title pages.
\fancypagestyle{plain}{%
\fancyhf{}
\renewcommand*\headrulewidth{0pt}
\renewcommand*\footrulewidth{0pt}
\fancyhead{\cropmarks}
\fancyfoot[C]{\titlefont\thepage}
}
%% Fancy style for the main matter.
\fancypagestyle{mainmatter}{%
\fancyhf{}
%% Page numbers on the top left and top right.
\fancyhead[LE]{\cropmarks\lthumb\titlefont\thepage}
\fancyhead[RO]{\cropmarks\rthumb\titlefont\thepage}
%% Chapter name on the left (even) page.
%%\fancyhead[RE]{\changefont\titlefont\titleshape\nouppercase{\leftmark}} %%KA
%\fancyhead[RE]{\titlefont\titleshape\nouppercase{\leftmark}} %% KA
%% Section name on the right (odd) page.
%\fancyhead[LO]{\titlefont\titleshape\nouppercase{\rightmark}} %% KA
}
%% The mainmatter style is default for normal pages.
\pagestyle{mainmatter}
%% Print the current chapter and section at the top of the page in cyan.
\renewcommand*\chaptermark[1]{\markboth{\thechapter.\ \color{title}#1}{}}
\renewcommand*\sectionmark[1]{\markright{\thesection.\ \color{title}#1}}
%% The setheader command can be used to print the title of unnumbered chapters
%% in the page header.
\newcommand*\setheader[1]{\markboth{\color{title}#1}{\color{title}#1}}
%% Change the font size of fancy headers for chapters and section titles
\newcommand{\changefont}{\fontsize{9}{11}\selectfont}
%% Change the headrule command (from fancyhdr.sty) to draw the line below the
%% header in the title color.
\renewcommand*\headrule{%
\if@fancyplain%
\let\headrulewidth\plainheadrulewidth%
\fi%
{\color{title}\hrule\@height\headrulewidth\@width\headwidth}%
\vskip-\headrulewidth%
}
%% Draw the line above a footnote in the title color as well.
\renewcommand*\footnoterule{%
\vspace*{-3pt}%
{\color{title}\hrule width 0.5\textwidth height 0.4pt}%
\vspace*{2.6pt}%
}
%% A part title starts with a huge (96pt) bold black number, flushed to the
%% right, followed by the part name on the next line in the title color.
\titleformat{\part}[display]
{\flushright\titlestyle}
{\fontsize{96pt}{96pt}\selectfont\bfseries\thepart}
{0pt}
{\Huge\color{title}}
%% Separate the title from the text by two empty lines.
\titlespacing{\part}{0pt}{0pt}{2\baselineskip}
%% In the table of contents, the part name is preceded by an empty line, printed
%% in bold, and not followed by a line of dots.
\dottedcontents{part}[0em]{\vspace{\baselineskip}\titlefont\bfseries}{1.5em}{0pc}
%% Chapter titles have the same layout as parts.
\titleformat{\chapter}[display]
{\flushright\titlestyle}
{\fontsize{96pt}{96pt}\selectfont\bfseries\thechapter}
{0pt}
{\Huge\color{title}}
\titlespacing{\chapter}{0pt}{0pt}{2\baselineskip}
%% In the table of contents, a chapter is similar to a part, except that it is
%% preceded by half an empty line.
\dottedcontents{chapter}[1.5em]{\vspace{0.5\baselineskip}\titlefont\bfseries}{1.5em}{0pc}
%% Section titles start with the number in bold, followed by the name printed
%% in the title color.
\titleformat{\section}
{\Large\headerstyle}
{\bfseries\thesection.\ }
{0pt}
{\color{title}}
%% Sections are preceded by an empty line.
\titlespacing{\section}{0pt}{\baselineskip}{0pt}
%% In the table of contents, section names are followed by a line of dots 8pt
%% apart.
\dottedcontents{section}[3.8em]{\titlefont}{2.3em}{8pt}
%% Subsection titles have the same layout as section titles, except in a smaller
%% font.
\titleformat{\subsection}
{\large\headerstyle}
{\bfseries\thesubsection.\ }
{0pt}
{\color{title}}
\titlespacing{\subsection}{0pt}{\baselineskip}{0pt}
\dottedcontents{subsection}[7em]{\titlefont}{3.2em}{8pt}
%% Subsubsections have the same font and color as sections and subsections, but
%% are not preceded by a number.
\titleformat{\subsubsection}
{\headerstyle}
{}
{0pt}
{\color{title}}
%% Subsubsections are preceded by an empty line and do not appear in the table
%% of contents.
\titlespacing{\subsubsection}{0pt}{\bigskipamount}{0pt}
%% Color the bullets of the itemize environment and make the symbol of the third
%% level a diamond instead of an asterisk.
\renewcommand*\labelitemi{\color{title}\textbullet}
\renewcommand*\labelitemii{\color{title}--}
\renewcommand*\labelitemiii{\color{title}$\diamond$}
\renewcommand*\labelitemiv{\color{title}\textperiodcentered}
%% The dedication is vertically centered on a separate page and flushed to the
%% right.
\newcommand\dedication[1]{%
\thispagestyle{empty}%
\vspace*{\fill}%
\begin{flushright}%
#1%
\end{flushright}%
\vspace*{\fill}%
\cleardoublepage%
}
%% Define an unnumbered footnote command.
\def\blfootnote{\xdef\@thefnmark{}\@footnotetext}
%% The authors environment is used to display the authors of a chapter on the
%% title page. This is only necessary if multiple people contributed
%% significantly to the chapter.
\newcommand*\authors[1]{%
\begin{center}%
{\Large\bfseries #1}%
\end{center}%
\vspace{2\baselineskip}%
}
%% The epigraph environment can be used to to add a quote to the title page of
%% a chapter.
\newcommand\epigraph[3][2\baselineskip]{%
\begin{flushright}%
{\rmfamily\itshape #2}%
\vskip 0.5\baselineskip%
#3%
\end{flushright}%
\vspace{#1}%
}
%% The abstract environment is used for the abstract of a chapter.
\newenvironment{abstract}{%
\list{}{\leftmargin\rightmargin}%
\item%
\relax%
\rmfamily\itshape%
}{%
\endlist%
}
%% Define a drop command which can be used to generate drop caps at the
%% beginning of a section.
\renewcommand*\LettrineTextFont{\titleshape}
\newcommand*\dropcap[2]{
\lettrine[lines=2,findent=0.2em,nindent=0pt]{\color{title} #1}{#2}%
}
%% Create an unnumbered reference section.
\addto\captionsenglish{\renewcommand*\bibname{\color{title}References}}
\newcommand*\references[1]{%
%\section*{References}
\renewcommand{\bibname}{ \vspace{-\baselineskip}\vspace{0.0mm} }
\begin{multicols}{2}
\raggedcolumns
\small
\bibliographystyle{dissertation}%
\bibliography{#1}%
\end{multicols}
}
%\renewcommand{\refname}{ \vspace{-\baselineskip}\vspace{-1.1mm} }
%\bibliographystyle{plain}
%\bibliography{paper_ref}
%% Hyperlinks are cyan, except in print mode, when they are all black.
\hypersetup{
colorlinks = true,
citecolor = title,
linkcolor = title,
urlcolor = title
}
% Added setting
%\setlength{\parindent}{4em}
\usepackage{indentfirst}
%\setlength{\parindent}{1.5cm}%
% Change the margin temporarily
%\def\changemargin#1#2{\list{}{\rightmargin#2\leftmargin#1}\item[]}
%\let\endchangemargin=\endlist
% Caption next to the figure
%\newlength{\myimagewidth}
%\newlength{\mycaptionwidth}
%\setlength{\mycaptionwidth}{\textwidth-\myimagewidth-10pt}
%
%\newcommand{\setmyimagewidth}[1]{\setlength{\myimagewidth}{#1}
%\setlength{\mycaptionwidth}{\textwidth-\myimagewidth-10pt}}
% Footnote
\renewcommand{\thefootnote}{\fnsymbol{footnote}}
% Caption next to the figure code-2
\makeatletter
\define@cmdkey{iac}{left}[0pt]{}% \cmdKV@iac@left
\define@cmdkey{iac}{right}[0pt]{}% \cmdKV@iac@right
\define@cmdkey{iac}{figcapsep}[\tabcolsep]{}% \cmdKV@iac@figcapsep
\define@cmdkey{iac}{figwidth}[\relax]{}% \cmdKV@iac@figwidth
\define@cmdkey{iac}{capwidth}[\relax]{}% \cmdKV@iac@capwidth
\define@cmdkey{iac}{figlabel}[\relax]{}% \cmdKV@iac@figlabel
\define@cmdkey{iac}{captiontoc}[\relax]{}% \cmdKV@iac@captiontoc
\newcommand{\imageandcaption}[3][]{%
\setkeys{iac}{
left,right,figcapsep,figwidth,capwidth,figlabel,captiontoc,% Set default keys
#1% Set updated keys
}%
\expandafter\ifx\cmdKV@iac@figwidth\relax% No figure width supplied
\expandafter\ifx\cmdKV@iac@capwidth\relax% No caption width supplied
\def\cmdKV@iac@figwidth{.5\dimexpr\linewidth-\cmdKV@iac@left-\cmdKV@iac@right-\cmdKV@iac@figcapsep}%
\def\cmdKV@iac@capwidth{\cmdKV@iac@figwidth}%
\else% Caption width provided
\def\cmdKV@iac@figwidth{\dimexpr\linewidth-\cmdKV@iac@left-\cmdKV@iac@right-\cmdKV@iac@figcapsep-\cmdKV@iac@capwidth}%
\fi
\else% Figure width supplied
\expandafter\ifx\cmdKV@iac@capwidth\relax% No caption width supplied
\def\cmdKV@iac@capwidth{\dimexpr\linewidth-\cmdKV@iac@left-\cmdKV@iac@right-\cmdKV@iac@figcapsep-\cmdKV@iac@figwidth}%
\fi
\fi
\hspace*{\cmdKV@iac@left}% Indent from left margin
\includegraphics[valign=c,width=\cmdKV@iac@figwidth]{#2}% Insert image
\hspace*{\cmdKV@iac@figcapsep}% Space between image and caption
\begin{minipage}{\cmdKV@iac@capwidth}
\expandafter\ifx\cmdKV@iac@captiontoc\relax
\caption{#3}% \caption without ToC entry
\else
\caption[\cmdKV@iac@captiontoc]{#3}% \caption with ToC entry
\fi
\expandafter\ifx\cmdKV@iac@figlabel\relax\else
\label{\cmdKV@iac@figlabel}%
\fi
\end{minipage}%
\hspace*{\cmdKV@iac@right}% Space on right of construction
}
\makeatother
主要类别：
\documentclass{dissertation}
\begin{document}
%% Turn on thumb indices.
\thumbtrue
\include{chapter-6/chapter-6}
%% Turn off thumb indices for unnumbered chapters.
\thumbfalse
\end{document}
-- CHAPTER (there double column bibliography is used in here)
\chapter[Introduction]{Introduction}
\section{Introduction}
XYZ.\cite{Pavkovich1986, Parikh1979, Owen1990} KLM.\cite{Zhou2006, Stepanova2010, Dai2011a, Dai2011, Manfrinato2014, Chang1975, Rishton1987}
\section*{References}
\references{ref6}
\end{document}
希望你不需要 .bib 文件