\documentclass[12pt]{amsart}
\usepackage{url}
\begin{document}
\title{Template}
\author{Author$^1$, Author$^{2,*}$}
\maketitle
\begin{center}
{
\footnotesize $^1$Department of Mathematics, University, Country\\
$^2$Department of Mathematics, University, Country\\
$^*$Corresponding author: your email address\\
Received Jan. 1, 2019
}
\end{center}
\begin{abstract}
This is a sample latex document with emphasis on using math mode and
equation environments. You should use it as a template for your paper. Any references cited in the abstract must be given in full.
\noindent 2020 Mathematics Subject Classification. 00000; 00000.
\noindent Key words and phrases. mathematics; Asia pacific.
\end{abstract}
\vspace{10mm}
\section{Introduction}
This is a sample latex document with emphasis on using math mode and
equation environments. You should use it as a template for your paper \cite{ref1}. Ensure that every reference present in the reference list is cited in the text. Unpublished results are not recommended in the reference list. Please cite all references by \cite{}.
\begin{thebibliography}{99}
\bibitem{ref1} A. Name, Paper Title, Asia Pac. J. Math. 1 (2013), 1-10. \url{https://doi.org/00.00000/0000}.
\bibitem{ref2} A. Name, Book Title, Press, City, 2013.
\end{thebibliography}
\end{document}