K-density, N-density and finiteness properties. - Helmut Plünnecke (European Workshop on Applications and Theory in Petri Nets, 1984)

Determination of a poset by its co-relation. - Helmut Plünnecke (Applications and Theory in Petri Nets, 1985)

Bibliography of Petri nets. - Stefan Drees; Dominik Gomm; Helmut Plünnecke; Wolfgang Reisig; Rolf Walter (European Workshop on Applications and Theory of Petri Nets, 1986)

Bibliography on Petri nets 1990. - Helmut Plünnecke; Wolfgang Reisig (Applications and Theory of Petri Nets, 1990)