Manfred Kudlek.
Multisets and Petri nets - an overview.
JCISS, 33(3-4):339-355, 2008.
@Article{Kudlek08g,
author = {Kudlek, Manfred},
title = {Multisets and {Petri} Nets -- An Overview},
journal = {JCISS},
year = 2008,
volume = 33,
number = {3--4},
pages = {339--355}
}