Pierluigi Frisco, Oscar H. Ibarra. On Stateless Multihead Finite Automata and Multihead Pushdown Automata. In Volker Diekert, Dirk Nowotka, editors, Developments in Language Theory, 13th International Conference, DLT 2009, Stuttgart, Germany, June 30 - July 3, 2009. Proceedings. Volume 5583 of Lecture Notes in Computer Science, pages 240-251, Springer, 2009. [doi]
Abstract is missing.