Rüdiger Valk and Matthias Jantzen.
The residue of vector sets with applications to decidability problems
in Petri nets.
Acta Informatica 21, pages 643-674, 1985.
@ARTICLE{Valk+85, AUTHOR = {Valk, R{\"u}diger and Jantzen, Matthias}, JOURNAL = {Acta Informatica 21}, PAGES = {643--674}, TITLE = {The Residue of Vector Sets with Applications to Decidability Problems in {Petri} Nets}, YEAR = 1985 }