\documentclass{amcjou}

%\usepackage{graphicx}
%...

\begin{document}

\begin{frontmatter}   %%  Title, information about author, abstract, etc.

\titledata{Title of the paper}           % title of the paper
{Footnote on the title.}                 % footnote on the title -- empty if not required

\authordata{First. A. Author}            % First author name
{Institution, Address, City, Country}    % Affiliation and address
{email@address1.com}                     % E-mail address
{Footnote on the first author.}          % Footnote on the first author (grant number, thanks, 
                                         % web page, etc.) -- empty in not required

\authordata{Second B. Author}            % Second author
{Institution, Address, City, Country} 
{email@address2.com}
{}                                       % No footnote!

\authordata{Third. C. Author}            % Third author
{Institution, Address, City, Country}
{email@address3.com}
{Footnote on the third author.}

\keywords{Groups, graphs.}               % Keywords
\msc{05C15, 05C10}                       % Math. Subj. Class. codes

\begin{abstract}
The abstract should state the problem studied and the principal results proven\dots 
\end{abstract}

\end{frontmatter}   %% End of the front matter

%% Your article

\section{The first section}

Text in the first section. Text in the first section. Text in the first section.
Text in the first section. Text in the first section. Text in the first section.
Text in the first section. Text in the first section. Text in the first section.

\section{The second section}

Text in the second section. Text in the second section. Text in the second section.
Text in the second section. Text in the second section. Text in the second section.
Text in the second section. Text in the second section. Text in the second section.

\subsection{Subsection}

Text in the subsection. Text in the subsection. Text in the subsection.
Text in the subsection. Text in the subsection. Text in the subsection.

Examples of definitions, theorems, propositions\dots

\begin{defn}                            %% Environment for definition
Definition.
\end{defn}

\begin{thm}                             %% Environment for theorem
The first theorem.
\end{thm}
\begin{proof}
Proof of the first theorem.
\end{proof}
                                        %% More environments...
\noindent The following theorem-like environments can be used.
\begin{enumerate}
\item \texttt{thm} (Theorem)
\item \texttt{prop} (Proposition)
\item \texttt{lem} (Lemma)
\item \texttt{cor} (Corollary)
\item \texttt{claim} (Claim)
\item \texttt{axiom} (Axiom)
\item \texttt{conj} (Conjecture)
\item \texttt{hypo} (Hypothesis)
\item \texttt{assum} (Assumption)
\end{enumerate}

\noindent The following definition-like environments can be used.
\begin{enumerate}
\item \texttt{defn} (Definition)
\item \texttt{exmp} (Example)
\item \texttt{rem} (Remark)
\item \texttt{prob} (Problem)
\item \texttt{quest} (Question)
\item \texttt{alg} (Algorithm)
\end{enumerate}

%% Bibliography
Examples of references:~\cite{BI1}, \cite{BI2}, \cite{BI3}.

\begin{thebibliography}{99}

\bibitem{BI1}
First A. Author, Second B. Author and Third C. Author, 
Article title, 
\emph{Journal Title} \textbf{1} (1982), 1--100.

\bibitem{BI2}
First A. Author, 
\emph{Book title}, third ed., 
Publisher, New York, 1982.

\bibitem{BI3}
First A. Author and Second B. Author, 
Chapter in an edited book, 
in: First Editor, Second Editor (eds.), 
\emph{Book Title},
Publisher, Amsterdam, 1999, 232--345.

\end{thebibliography}

\end{document}