Multi-tape Automata with Symbol Classes. - Florent Nicart; Jean-Marc Champarnaud; Tibor Csáki; Tamás Gaál; André Kempe (CIAA, 2006)

Labelling Multi-Tape Automata with Constrained Symbol Classes. - Florent Nicart; Jean-Marc Champarnaud; Tibor Csáki; Tamás Gaál; André Kempe (Int. J. Found. Comput. Sci., 2007)