Dictionary Operations in Membrane Computing. - Hirofumi Tagawa; Akihiro Fujiwara (FCS, 2009)

Asynchronous P systems for SAT and Hamiltonian cycle problem. - Kota Ishii; Akihiro Fujiwara; Hirofumi Tagawa (NaBIC, 2010)

Solving SAT and Hamiltonian Cycle Problem Using Asynchronous P Systems. - Hirofumi Tagawa; Akihiro Fujiwara (IEICE Trans. Inf. Syst., 2012)