18868 Paolo Baldan/Roberto Bruni/Ugo Montanari: Pre-nets, read arcs and unfolding - a functorial presentation. Internet ca. 2002, 20p. 18877 Marek Bednarczyk/Andrzej Borzyszkowski: General morphisms of Petri nets. Internet ca. 2000, 21p. 18870 Roberto Bruni/Jose' Meseguer/Ugo Montanari/Vladimiro Sassone: A comparison of Petri net semantics under the collective token philosophy. Internet ca. 1998, 17p. 19795 Roberto Bruni/Jose' Meseguer/Ugo Montanari/Vladimiro Sassone: Functorial models for Petri nets. Internet 2001, 38p. 18869 Roberto Bruni/Jose' Meseguer/Ugo Montanari/Vladimiro Sassone: Algebraic theories for contextual pre-nets. Internet ca. 2004, 14p. 10422 Claudia Ermel/Alfio Martini: A taste of categorical Petri nets. TU Berlin Ber. 96-9 (1996), 38p. H. Ehrig/J. Padberg: A uniform approach to Petri nets. In Freksa a.o. 1997, 219-231. Claudia Ermel: Kategorielle Darstellung von Stellen-Transtions-Netzen. Studienarbeit TU Berlin 1994. 19871 Claudia Ermel/Alfio Martini: A taste of categorical Petri nets. Internet TU Berlin 1996, 38p. Christian Freksa a.o. (ed.): Foundations of computer science. Springer LN CS 1337 (1997). 3-540-63746-X. 10434 Fabio Gadducci/Ugo Montanari: Enriched categories as models of computation. Internet ca. 1995, 23p. 18866 Joseph Goguen: A categorical manifesto. Internet ca. 1991, 20p. 19862 Ahmet Husainov: On the homology of small categories and asynchronous transition systems. Homology, Homotopy Appl. 6/1 (2004), 439-471. 21719 Chiara Leardini: Reti di Petri e analisi formale dei concetti. Tesi LS Ferrara 2010, 150p. 18875 Johan Lilius: A sheaf semantics for Petri nets. Internet 1993, 14p. Jose' Meseguer/Ugo Montanari: Petri nets are monoids. Information & Comp. 88/2 (1990), 105-155. 19863 Mogens Nielsen/Glynn Winskel: Petri nets and bisumulation. Theor. Computer Science 153 (1996), 211-244. 18886 Julia Padberg: Classification of Petri nets using adjoint functors. Internet 1998, 7p. 19873 Julia Padberg/U. Prange/Hartmut Ehrig/Claudia Ermel/K. Hoffmann: Petrinetze. Vorlesung TU Berlin 2005, 290p. 18783 Vladimiro Sassone: On the algebraic structure of Petri nets. Bull. EATCS ... (2000), 17p. 18874 Viorica Sofronie: Towards a sheaf semantics for cooperating agent scenarios. Internet ca. 1997, 16p. 18873 Viorica Sofronie/Karel Stokkermans: Modeling interaction by sheaves and geometric logic. Internet ca. 1998, 12p. 19868 Glynn Winskel: Events in computation. PhD thesis Univ. Edinburgh 1980, 294p. 19869 Glynn Winskel: Event structures. Springer LN CS 255 (1987), 325-392. 19864 Glynn Winskel: Topics in concurrency. Lecture Notes Internet 2005, 130p.