His earlier works cover topics that include formal languages, unification, graph pebbling and others. Most of his research works since the early 1990s were in the areas of Communication Networks and Distributed Computing. These works include studies of complexity issues for various problems and models of Interval Routing, and for various problems and topics in distributed computing (like oriented and unoriented networks) and in interconnection networks.
Ruzicka was a regular participant in many conferences in this area, including DISC and SIROCCO; he was on the program committees of DISC 1998 [1] and 2000 [2] and SIROCCO 1999.[3] He also enthusiastically organised DISC 1999 [4] in Bratislava – held for the first time in a former East-European country, which proved to be a great success, highly appreciated by the Steering Committee and the whole audience. He participated and was very actively involved in other conferences, including ICALP, SOFSEM and MFCS. These activities included co-chairing MFCS 1994,[5] chairing MFCS 1997 [6] and chairing SOFSEM 2001,[7] and being on the program committees of MFCS 2000 and SOFSEM 1997.
Committee for Academic and Scientific Literature and Computer Programmes of the Slovak Literary Fund granted to Peter Ruzicka in memoriam and collective, Award of acknowledgement for Academic and Scientific Literature for 2005 in the category of Natural and Technical Sciences for the book Dissemination of Information in Communication Networks.
Peter Ruzicka has authored and co-authored numerous publications and books. One of his last projects he worked on had been an EATCS Series book on Dissemination of Information in Communication Networks[8]
Pacholski, Leszek; Ružička, Peter, eds. (2001-11-07). SOFSEM 2001: Theory and Practice of Informatics. 28th Conference on Current Trends in Theory and Practice of Informatics Piešt’any, Slovak Republic, November 24 – December 1, 2001 Proceedings. LNCS. Vol. 2234. Springer-Verlag. doi:10.1007/3-540-45627-9. ISBN3-540-42912-3. ISSN0302-9743.
^Královič, Rastislav; Ružička, Peter (1999). "Rank of Graphs: The Size of Acyclic Orientation Cover for Deadlock-Free Packet Routing". SIROCCO 6. Proceedings of the 6th International Colloquium on Structural Information and Communication Complexity, Lacanau-Océan, France. Proceedings in informatics. Vol. 5. Carleton Scientific. pp. 181–193. ISBN1-894145-04-6.
^Prívara, Igor; Ružička, Peter, eds. (1997-08-13). Mathematical Foundations of Computer Science 1997. 22nd International Symposium, MFCS '97 Bratislava, Slovakia, August 25–29, 1997 Proceedings. LNCS. Vol. 1295. Springer-Verlag. doi:10.1007/BFb0029943. ISBN3-540-63437-1. ISSN0302-9743.
^Pacholski, Leszek; Ružička, Peter, eds. (2001-11-07). SOFSEM 2001: Theory and Practice of Informatics. 28th Conference on Current Trends in Theory and Practice of Informatics Piešt’any, Slovak Republic, November 24 – December 1, 2001 Proceedings. LNCS. Vol. 2234. Springer-Verlag. doi:10.1007/3-540-45627-9. ISBN3-540-42912-3. ISSN0302-9743.