Calude, C. S., Costa, J. ̌., Dershowitz, N., Freire, E., & Rozenberg, G. (2009). Unconventional Computation: 8th International Conference, UC 2009, Ponta Delgada, Portugal, September 7-11, 2009. Proceedings. Berlin, Heidelberg: Springer Berlin Heidelberg.

Calude, Cristian S., Jos ̌Fľix Costa, Nachum Dershowitz, Elisabete Freire, and Grzegorz Rozenberg. Unconventional Computation: 8th International Conference, UC 2009, Ponta Delgada, Portugal, September 7-11, 2009. Proceedings. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009.

Calude, Cristian S., et al. Unconventional Computation: 8th International Conference, UC 2009, Ponta Delgada, Portugal, September 7-11, 2009. Proceedings. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009.