- Constructive chaos by cellular automata and possible sources of an arrow of time. 1990. (In
)*Cellular Automata: theory and experiment* - Undecidability everywhere?. 1996. (In
*Boundaries and Barriers*) - The Church-Turing Thesis as a Guiding Principle for Physics. 1998. (In
*Unconventional Models of Computation, UMC'98*) - Quantum Information: The New Frontier. 2001. (In
*Unconventional Models of Computation, UMC'2K*)