Pedro García Manuel Vazquez de Parga Gloria Alvarez José Ruiz Learning Regular Languages Using Nondeterministic Finite Automata. 92-101 2008 CIAA http://dx.doi.org/10.1007/978-3-540-70844-5_10 conf/wia/2008 db/conf/wia/ciaa2008.html#GarciaPAR08