Computational Complexity of Simple P Systems. - Gabriel Ciobanu; Andreas Resios (Fundam. Informaticae, 2008)

Evolving by Maximizing the Number of Rules: Complexity Study. - Oana Agrigoroaiei; Gabriel Ciobanu; Andreas Resios (Workshop on Membrane Computing, 2009)

Complexity of evolution in maximum cooperative P systems. - Gabriel Ciobanu; Andreas Resios (Nat. Comput., 2009)