F. Bacelli/G. Cohen/G. Olsder/J. Quadrat: Synchronization and linearity - an algebra for discrete event systems. Wiley 1992. E. Best/R. Devillers/M. Koutny: Petri net algebra. Springer 2000, 380p. DM 89. V. Diekert: Combinatorics on traces. Springer 1990. V. Diekert/Grzegorz Rosenberg: The book on traces. World Scientific 1995. Hartmut Ehrig/Julia Padberg/Grzegorz Rosenberg: Behaviour and realization construction for Petri nets based on free monoids and power set graphs. Workshop Concurrency, Specification and Programming HU Berlin 1994, ... 18889 Gabriel Juhas: Petri nets with generalized algebra - a comparison. Internet 1999, 15p. 10437 Ekkart Kindler/Wolfgang Reisig: Algebraic system nets for modelling distributed algorithms. Internet ca. 1997, 25p. 10449 Ekkart Kindler/Tobias Vesper: Automatisch u''berpru''fbare Beweistechniken fu''r algebraische Petrinetze. Internet ca. 1997, 6p. 18782 Bodo Möller: Algebraische Petrinetze. Diplomarbeit Univ. Hamburg 1999, 95p. 20308 Sibylle Peuker: Halbordnungsbasierte Verfeinerung zur Verifikation verteilter Algorithmen. Diss. HU Berlin 2001, 170p. Wolfgang Reisig: Petri nets and algebraic specifications. Theor. Comp. Sci. 80 (1991), 1-34. 10389 Karsten Schmidt: On the computation of place invariants for algebraic Petri nets. Internet ca. 1992, 18p. 10405 Karsten Schmidt: Implementation der Umgebung eines Programms zur Pru''fung und Berechnung von Invarianten algebraischer Petrinetze. Diplomarbeit HU Berlin 1993. 10387 Karsten Schmidt: Computations of invariants for algebraic Petri nets. Internet 1994, 23p. 10395 Karsten Schmidt: T-invariants of algebraic Petri nets. Internet 1994, 41p. 10394 Karsten Schmidt: Symbolische Analysemethoden fu''r algebraische Petrinetze. Internet ca. 1995, 6p. 10388 Karsten Schmidt: Parametrized reachability trees for algebraic Petri nets. Internet ca. 1995, 10p. 10407 Karsten Schmidt: Siphons and traps of algebraic Petri nets. Internet ca. 1996, 12p. Karsten Schmidt: Symbolische Analysemethoden fu''r algebraische Petrinetze. Dissertation HU Berlin. Bertz ca. 1996. 3-929470-54-3. 10448 Karsten Schmidt: How to calculate symbolically siphons and traps for some algebraic Petri nets. Helsinki Res. Rep. A 39 (1996). 22829 Anne Shiu/Bernd Sturmfels: Siphons in chemical reaction networks. Internet 2010, 19p.