BibTeX 中未显示页面和发布者属性。
elsarticle-template-num.tex 文件：
\documentclass[preprint,12pt]{elsarticle}
\usepackage{xurl}
\usepackage{amssymb}
\journal{Nuclear Physics B}
\begin{document}
\begin{frontmatter}
\section{Introduction}
several other countries\cite{R1}.
BibTeX 文件：
@techreport{R1,
author = {Organization, World Health},
mendeley-groups = {Covid 19 Chest Xray},
pages = {9 p.},
publisher = {World Health Organization},
title = {{Coronavirus disease 2019 (COVID-19): situation report, 51}},
type = {Technical documents}
}
参考文件编译自：
