621.8 Arb A Arbib, Michael A Algebraic theory of machines, langua- ges, and semigroups. Edited by Michael A. Arbib with a major contribution by Kenneth Krohn and John L. Rhodes. New York, Aca- demic Press, 1968 xvi, 359 p- ilus. 23 cm. I Blbliografia al final de los capitulos