References:

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Literature related to cycloids:

C.A. Petri, Collection of Handwritten Scripts on Cycloids, Lecture Milano, April 1989.
Petri-Milano-lectures.

C. A. Petri, On Technical Safety and Security, Petri Net Newsletter, 1989. Vol. 33, pp.25-30.
https://www.cycloids.de/Petri-Safety-Security-1.pdf.
https://www.informatik.uni-augsburg.de/pnnl/.

C.A. Petri, CY. Yuan, On Technical Safety and Security (continued), Petri Net Newsletter, 1990, Vol. 35 (1990), pp. 8-15.
https://www.cycloids.de/Petri-Yuan-Safety-Security-2.pdf.
https://www.informatik.uni-augsburg.de/pnnl/.

C.A. Petri, Collection of Handwritten Scripts on Cycloids, Lecture University of Hamburg, 1990/91.
Petri-Hamburg-lectures.

C.A. Petri, Nets, Time and Space, Theoretical Computer Science, Vol.153, (1996), pp. 3-48.
doi: 10.1016/0304-3975(95)00116-6

O. Kummer, M-O. Stehr, Petri's Axioms of Concurrency - a Selection of Recent Results, in:Application and Theory of Petri Net 1997, Vol. 1248 of Lecture Notes in Computer Science, Springer-Verlag, Berlin, (1997), pp. 195-214.
doi: 10.1007/3-540-63139-9_37

C.A. Petri, Letter of C.A. Petri with respect to the work of Olaf Kummer and Mark-Oliver Stehr on Concurrency Axioms (1997).
Petri's letter.

M-O. Stehr, System Specification by Cyclic Causality Constraints. Technical Report 210, Department of Informatics, Univ. Hamburg, (1998).

M-O. Stehr, Thinking in Cycles. in: Application and Theory of Petri Nets and Concurrency, Vol. 1420 of Lecture Notes in Computer Science, Springer-Verlag, Cham, (1998), pp. 205-225.
doi:10.1007/3-540-69108-1_12.

M-O. Stehr, Characterizing Security in Synchronization Graphs. Petri Net Newsletter, Vol. 56 (1999), 17-26
https://www.cycloids.de/Stehr-Security.pdf.
https://www.informatik.uni-augsburg.de/pnnl/.

O. Kummer, Axiomatic Systems in Concurrency Theory. Logos Verlag Berlin, (2001).

C. A. Petri, Slides of the Lecture "Systematics of Net Modelling, Hamburg, (2004).
http://uhh.de/inf-petri-sysnetmod.

U. Fenske, Zykloide und Überlegungen zur Verallgemeinerung, Diploma Thesis, Dep. of Informatics, Univ. Hamburg, (2008).

C.A. Petri, R. Valk, On the Physical Basics of Information Flow - Results obtained in cooperation Konrad Zuse, Petri Nets 2008.
https://www2.informatik.uni-hamburg.de/TGI/mitarbeiter/profs/petri/Xian_Petri_Valk.pdf.

R. Valk, From Fundamental Laws in Physics to Coordination Principles, in Tutorial: Nets, Physics and Coordination, A tribute to the work of Carl Adam Petri and Anatol W. Holt, Milano, (2013).
http://uhh.de/inf-valk-tutorium-npc.

R. Valk, On the Structure of Cycloids Indroduced by Carl Adam Petri, in: Application and Theory of Petri Nets and Concurrency, Vol. 10877 of Lecture Notes in Computer Science, Springer-Verlag, Cham, (2018), pp. 294-314.
doi: 10.1007/978-3-319-91268-4_15.

R. Valk , On the Two Worlds of Carl Adam Petri's Nets, in: W.Reisig, G.Rozenberg (Eds.), Carl Adam Petri: Ideas, Personality, Impact, Springer, Cham, (2019), pp. 37-44.
doi: 10.1007/978-3-319-96154-5

R. Valk, Properties of Petri's Cycloid Systems, Fundamenta Informaticae Vol. 169, (2019), pp. 85-121.
doi: 10.3233/FI-2019-1840 .

B. Jessen, D. Moldt, Some Simple Extensions of Petri's Cycloids, in: M.Köhler-Bussmeier, E.Kindler,H.Rölke (Eds.), PNSE 2020 Petri Nets and Software Engineering, CEUR Workshop Proceedings, http://ceur-ws.org/Vol-2651/paper13.pdf , (2020), pp. 194-212.

R. Valk, Circular Traffic Queues and Petri's Cycloids, in: Application and Theory of Petri Nets and Concurrency, Vol. 12152 of Lecture Notes in Computer Science, Springer-Verlag, Cham, (2020), pp. 176-195.
doi: 10.1007/978-3-030-51831-8.

R. Valk, D. Moldt, On Reductions of Cycloids, in: M.Köhler-Bussmeier, H.Rölke, D. Moldt (Eds.), PNSE 2022 Petri Nets and Software Engineering, CEUR Workshop Proceedings, https://ceur-ws.org/Vol-3170/paper6.pdf.