Elena Czeizler Eugen Czeizler Lila Kari Kai Salomaa On the descriptional complexity of Watson-Crick automata. 3250-3260 2009 410 Theor. Comput. Sci. 35 http://dx.doi.org/10.1016/j.tcs.2009.05.001 db/journals/tcs/tcs410.html#CzeizlerCKS09