%
%  Please avoid your macros
%
\documentclass[12pt]{amsart}
\newcommand{\schtitle}[1]{\begin{center}\textbf{#1}%
\end{center}}
\newcommand{\schauthor}[1]{\begin{center}\emph{#1}%
\end{center}}
\newcommand{\schadress}[1]{\begin{center} \scriptsize #1%
\end{center}}
\begin{document}
\schtitle{My abstract}
\schauthor{Ivan I. Ivanov}
\schadress{Some State University\\
Universitetskaya, 1, Somewhere, 111111 Russia}

The main results of \cite{Iva}...

\begin{thebibliography}{9}
\bibitem{Iva}
Ivanov I.: Approximation property for von Neumann algebras. J. Funct. Anal. 48 (2002), no. 3, suppl., 549--571.
\end{thebibliography}
\end{document}      