\documentclass[11pt]{article}
\usepackage{amsmath,amssymb,amstext, theorem}

 
%%% FILL THE TITLE AND THE FULL NAMES OF THE AUTHORS
\title{\Large\bf Titlul comunic\u arii}
  \vskip 1.5em
\author{\sc ${Autor 1}^{(1)}$, .... , ${Autor \,n}^{(n)}$}
\date{}

%%%% MACROS AND DEFINITIONS 
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\addtolength{\evensidemargin}{-12mm} \addtolength{\voffset}{-6mm}
\addtolength{\textheight}{18mm}
\addtolength{\headsep}{-3pt}
\cleardoublepage \pagestyle{myheadings}
\usepackage[strict]{changepage}
\def\abstractname{Abstract -}   % <-----------------
\def\abstract{\begin{adjustwidth}{1cm}{1cm} \par    \footnotesize \noindent {\bf \abstractname} 
\def\endabstract{ \end{adjustwidth} \smallskip }}
\def\keywordsname{Key words and phrases~:} %<------------------
\def\keywords{\begin{adjustwidth}{1cm}{1cm} \par\footnotesize \noindent{\bf \keywordsname}
\def\endkeywords{ \end{adjustwidth} \smallskip}}
\def\MSCname{Mathematics Subject Classification {\rm(2000)}~:} % <-----------------
\def\MSC{ \begin{adjustwidth}{1cm}{1cm} \par\footnotesize\noindent{\bf \MSCname\/}
\def\endMSC{ \end{adjustwidth}  }}

%%%%% COMMANDS FOR THEOREMS
{\theorembodyfont{\itshape}\newtheorem{theorem}{Theorem}[section]}
{\theorembodyfont{\itshape}\newtheorem{proposition}{Proposition}[section]}
{\theorembodyfont{\itshape}\newtheorem{definition}{Definition}[section]}
{\theorembodyfont{\itshape}\newtheorem{lemma}{Lemma}[section]}
{\theorembodyfont{\itshape}\newtheorem{corollary}{Corollary}[section]}
{\theorembodyfont{\rm}\newtheorem{notation}{Notation}[section]}
{\theorembodyfont{\rm}\newtheorem{remark}{Remark}[section]}
{\theorembodyfont{\rm}\newtheorem{hypothesis}{Hypothesis}[section]}
{\theorembodyfont{\rm }\newtheorem{example}{Example}[section]}
\def\proof{{\noindent \bf Proof.~}}
\def\endproof{\hspace{\fill}{\boldmath $\Box$}\par}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 \begin{document}
\maketitle




\section*{Rezumat} 

V\u a rug\u am s\u a insera\c ti textul rezumatului, cel mult 
1/2 pagin\u a.

\subsubsection*{Cuvinte cheie}

Introduce\c ti c\^a\c tiva termeni matematici folosi\c ti \^\i n lucrare 

\subsubsection*{MSC 2010}

Insera\c ti clasificarea lucr\u arii folosind 
{\tt http://ams.org/msc}
 
%%%%%%%% Autorii 

 { \footnotesize  
\medskip
\medskip
 \vspace*{1mm} 
 
\noindent {\it Autorul 1}\\  
Institu\c tia: \\
Pozi\c tia: \\ 
E-mail: {\tt autor1@institutia}\\   

....................

\noindent {\it Autorul n}\\  
Institu\c tia: \\
Pozi\c tia: \\ 
E-mail: {\tt autorn@institutia}\\   

 
 \end{document}