\documentclass{procDDs}
% load packages only if necessary
\title{Title of the Paper
(if long, it will be automatically split into several lines)}
\author{\textbf{Ivanov}, Petrov1, Petrov2, Petrov3, Petrov4, Petrov5, Petrov6,}
{Department Shizics, University of Nowhere, Atlantida}
% lecturer given in bold
{author@e.mail} % e-mail of lecturer
%
% % it is important not to have
% % blank lines between the
% % \author and \coauthor
%
\coauthor{ Petrov7, Petrov8, Petrov9, Petrov10, Petrov11, Petrov 12,}
{Department Shizics, University of Nowhere, Atlantida}
{author@e.mail}
\coauthor{Sidorov} % Co-author(s) with
{Department of Marazmatics, King Saud University, Saudy Arabia} % another affiliation
{coauthor@e.mail } % use such line
% if e-mail none available
\coauthor{Winny The Pooh} % Co-author(s) with
{Institute, University, Country} % another affiliation
{coauthor@e.mail } % use such line
\begin {document}
\maketitle
\index{Author1, I.I.} % write this for each author
\index{Author2, I.I.} % to generate the index
\index{Coauthor, I.I.} %
\end {document}