@INCOLLECTION{grahlmann:5/95,
        AUTHOR             = {Bernd Grahlmann},
        BOOKTITLE          = {{\cite{best_fleischhack:5/95}}},
        MONTH              = may,
        PAGES              = {{7--16}},
        PUBLISHER          = {{Universit{\"a}t Hildesheim}},
        TITLE              = {{An Introduction to the Principles, the Functionality
and the Use of the PEP System}},
        YEAR               = {{1995}}
}

@BOOK{best_fleischhack:5/95,
        EDITOR             = {Eike Best and Hans Fleischhack},
        MONTH              = may,
        NUMBER             = {{14/95}},
        PUBLISHER          = {{Universit{\"a}t Hildesheim}},
        SERIES             = {{Hildesheimer Informatik-Berichte}},
        TITLE              = {{PEP: Programming Environment Based on Petri Nets}},
        YEAR               = {{1995}}
}