答案1
您可以通过在环境内容末尾插入这段代码来添加自定义节点tikzpicture（并删除或注释掉由此代码替换的其他节点）：
\draw[black] (55:85pt) -- (55:115pt) arc (55:65:115pt)
node[draw, anchor=south east] {\tiny\cite{einstein,dirac,knuth-fa,knuthwebsite}};
也许可以使用\arcarrow此代码中定义的宏来绘制连接线，但我并不完全了解它应该如何工作（主要是因为我没有花时间充分研究它），所以我只是忽略了它。
完整代码（取自链接问题）：
\documentclass{article}
\usepackage[utf8]{inputenc}
\title{Sunburst with References}
\date{}
%%% IMPORT
\usepackage{hyperref} % hyperlinks
\usepackage{url} % simple URL typesetting
\usepackage{graphicx}
\usepackage{xcolor}
\definecolor{orange1}{HTML}{F1753A}
\definecolor{orange2}{HTML}{F7A13E}
\definecolor{orange3}{HTML}{FC6300}
\definecolor{root}{HTML}{B2B2B2}
\usepackage{tikz}
\usepackage{pgfmath}
\usetikzlibrary{decorations.text, arrows.meta,calc,shadows.blur,shadings}
\renewcommand*\familydefault{\sfdefault} % Set font to serif family
% arctext from Andrew code with modifications:
%Variables: 1: ID, 2:Style 3:box height 4: Radious 5:start-angl 6:end-angl 7:text {format along path}
\def\arctext[#1][#2][#3](#4)(#5)(#6)#7{
\draw[
color=white,
thick,
line width=1.3pt,
fill=#2
]
(#5:#4cm+#3) coordinate (above #1) arc (#5:#6:#4cm+#3)
-- (#6:#4) coordinate (right #1) -- (#6:#4cm-#3) coordinate (below right #1)
arc (#6:#5:#4cm-#3) coordinate (below #1)
-- (#5:#4) coordinate (left #1) -- cycle;
\def\a#1{#4cm+#3}
\def\b#1{#4cm-#3}
\path[
decoration={
raise = -0.5ex, % Controls relavite text height position.
text along path,
text = {#7},
text align = center,
},
decorate
]
(#5:#4) arc (#5:#6:#4);
}
\def\arcbase[#1][#2][#3](#4)(#5)(#6)#7{
\draw[
color=#2,
thin,
line width=1.3pt,
% fill=black
]
(#5:#4cm+#3) coordinate (above #1) arc (#5:#6:#4cm+#3)
-- (#6:#4) coordinate (right #1) -- (#6:#4cm-#3) coordinate (below right #1)
arc (#6:#5:#4cm-#3) coordinate (below #1)
-- (#5:#4) coordinate (left #1) -- cycle;
\def\a#1{#4cm+#3}
\def\b#1{#4cm-#3}
\path[
decoration={
raise = -0.5ex, % Controls relavite text height position.
text along path,
text = {#7},
text align = center,
},
decorate
]
(#5:#4) arc (#5:#6:#4);
}
%arcarrow, this is mine, for beerware purpose...
%Function: Draw an arrow from arctex coordinate specific nodes to another
%Arrow start at the start of arctext box and could be shifted to change the position
%to avoid go over another box.
%Var: 1:Start coordinate 2:End coordinate 3:angle to shift from acrtext box
\def\arcarrow[#1](#2)(#3)[#4]{
\draw[thick,-,>=latex,color=#1,line width=1pt,shorten >=-0pt, shorten <=-0pt]
let \p1 = (#2), \p2 = (#3), % To access cartesian coordinates x, and y.
\n1 = {veclen(\x1,\y1)}, % Distance from the origin
\n2 = {veclen(\x2,\y2)}, % Distance from the origin
\n3 = {atan2(\y1,\x1)} % Angle where acrtext starts.
in (\n3-#4: \n1) -- (\n3-#4: \n2); % Draw the arrow.
}
%%%========================================================================
\begin{document}
\maketitle
\section{Chart}
\begin{tikzpicture}[
% Environment Cfg
font=\sf \scriptsize,
% Styles
myarrow/.style={
thick,
-latex,
},
Center/.style ={
circle,
fill=white,
text=root,
align=center,
font =\footnotesize,
inner sep=1pt,
},
]
% Drawing the center
\node[Center](ROOT) at (0,0) {Root \\ Node};
% Drawing the Tex Arcs
% \Arctext[ID][box-style][box-height](radious)(start-angl)(end-angl){|text-styles| Text}
% Node 1:
\arctext[N1][orange1][15pt](1.5)(200)(90){|\footnotesize\bf\color{white}| Node 1};
%Sub 1:
\arctext[N1S1][orange1][13pt](2.5)(120)(90){|\footnotesize\bf\color{white}| Sub1};
\arctext[N1S1S1][orange1][8pt](3.25)(120)(90){|\footnotesize\bf\color{white}| Sub1-Sub1};
%Sub 2:
\arctext[N1S2][orange1][13pt](2.5)(160)(120){|\footnotesize\bf\color{white}| Sub2};
\arctext[N1S2S1][orange1][8pt](4)(170)(140){|\footnotesize\bf\color{white}| Sub2-Sub1};
\arctext[N1S2S2][orange1][8pt](4)(140)(110){|\footnotesize\bf\color{white}| Sub2-Sub2};
%Sub 3:
\arctext[N1S3][orange1][13pt](2.5)(200)(160){|\footnotesize\bf\color{white}| Sub3};
%Node 2:
\arctext[N2][orange2][15pt](1.5)(-90)(90){|\footnotesize\bf\color{white}| Node 2};
%Sub 1:
\arctext[N2S1][orange2][13pt](2.5)(90)(50){|\footnotesize\bf\color{white}| Sub 1};
\arctext[N2S1S1][orange2][8pt](3.25)(90)(60){|\footnotesize\bf\color{white}| Sub3-Sub1};
%\arcbase[N2S1S2][orange2][8pt](3.9)(80)(50){|\tiny| {\cite{einstein,dirac,knuth-fa,knuthwebsite}}};
%Sub 2:
\arctext[N2S2][orange2][13pt](2.5)(50)(20){|\footnotesize\bf\color{white}| Sub 2};
\arctext[N2S2S1][orange2][6pt](4.5)(40)(15){|\scriptsize\bf\color{white}| Sub3-Sub1};
\arctext[N2S2S2][orange2][6pt](4.5)(60)(40){|\scriptsize\bf\color{white}| Sub3-Sub2};
%Sub 3:
\arctext[N2S3][orange2][13pt](2.5)(-40)(20){|\footnotesize\bf\color{white}| Sub 3};
\arctext[N2S3S1][orange2][8pt](3.25)(20)(-10){|\footnotesize\bf\color{white}| Sub3-Sub1};
\arctext[N2S3S2][orange2][8pt](3.25)(-40)(-10){|\footnotesize\bf\color{white}| Sub3-Sub2};
%Sub 4:
\arctext[N2S4][orange2][13pt](2.5)(-90)(-40){|\footnotesize\bf\color{white}| Sub 4};
%Node 3:
\arctext[N3][orange3][15pt](1.5)(200)(270){|\footnotesize\bf\color{white}| Node 3};
\arctext[N3S1][orange3][13pt](2.5)(200)(235){|\footnotesize\bf\color{white}| Sub 1};
\arctext[N3S2][orange3][13pt](2.5)(235)(270){|\footnotesize\bf\color{white}| Sub 2};
\arctext[N3S2S1][orange3][8pt](4)(250)(270){|\scriptsize\bf\color{white}| Sub2-Sub1};
\arctext[N3S2S2][orange3][8pt](4)(230)(250){|\scriptsize\bf\color{white}| Sub2-Sub2};
%Drawing the Arrows
%\arcarrow(above/below ID)(abobe/below ID)[shift]
\arcarrow[orange1](below N1S2S2)(above N1S2)[10];
\arcarrow[orange1](below N1S2S1)(above N1S2)[17];
\arcarrow[orange2](below N2S2S1)(above N2S2)[10];
\arcarrow[orange2](below N2S2S2)(above N2S2)[15];
%\arcarrow[orange2](below N2S1S2)(above N2S2)[25];
\arcarrow[orange3](below N3S2S1)(above N3S2)[-10];
\arcarrow[orange3](below N3S2S2)(above N3S2)[-10];
% new code %
\draw[black] (55:85pt) -- (55:115pt) arc (55:65:115pt)
node[draw, anchor=south east] {\tiny {\cite{einstein,dirac,knuth-fa,knuthwebsite}}};
% ======== %
\end{tikzpicture}
\begin{thebibliography}{2}
\bibitem{einstein}
\bibitem{dirac}
\bibitem{knuth-fa}
\bibitem{knuthwebsite}
\end{thebibliography}
\clearpage
\bibliographystyle{unsrt}
%\bibliography{bib} %%% Remove comment to use the external .bib file (using bibtex).
\end{document}
结果：
