Carlo Mereghetti Beatrice Palano Giovanni Pighizzini Note on the Succinctness of Deterministic, Nondeterministic, Probabilistic and Quantum Finite Automata. 477-490 2001 35 ITA 5 http://dx.doi.org/10.1051/ita:2001106 db/journals/ita/ita35.html#MereghettiPP01