How to don't remove the break when I use twocolumn after onecolumn?

Question

I have a problem; when I add \twocolumn after \onecolumn, my page is breaked :

    \documentclass[twocolumn]{svjour3}  
        ...
        \begin{document}
    %
    \author{123 \and
            456 \and
            789
    }
    \institute{AAAAAA \at
                  BBBBB \\}
    %
\onecolumn
            \maketitle
            \begin{abstract}
              ...
            \end{abstract}

\twocolumn 
        \end{document}

Answer 1

\twocolumn always starts a new page but has an optional argument that allows the specification of text that spans the columns.

 \documentclass[twocolumn]{svjour3}  
\title{Zzzz the title zzz zzzz zzzz zzzz zzzzz}
\date{today}
\journalname{zz}
        \begin{document}
    %
    \author{123 \and
            456 \and
            789
    }
    \institute{AAAAAA \at
                  BBBBB \\}
    %
\twocolumn[
            \maketitle
            \begin{abstract}
             Abstract abstract abstract abstract abstract abstract abstract.
             Abstract abstract abstract abstract abstract abstract abstract.
             Abstract abstract abstract abstract abstract abstract abstract.
             Abstract abstract abstract abstract abstract abstract abstract.
             Abstract abstract abstract abstract abstract abstract abstract.
             Abstract abstract abstract abstract abstract abstract abstract.
             Abstract abstract abstract abstract abstract abstract abstract.
            \end{abstract}
]

 \def \texta{One two three four five six seven eight nine ten. }
\def\textb{\texta\texta\texta\texta\texta\texta\texta}
\textb

\textb\textb\textb\textb

Red blue yellow \texta\textb\textb
        \end{document}