VOLUME 4 1999 NUMBER 4

Petr Jančar, František Mráz, Martin Plátek, Jörg Vogel:
On Monotonic Automata with a Restart Operation287–311
Rainer Kemp:
On Leftist Simply Generated Trees313–331
Maria Madonia, Sergio Salemi, Tecla Sportelli:
Covering Submonoids and Covering Codes333–350
Huei-Jan Shyr, Shyr-Shen Yu:
Some Properties of Left Non-Cancellative Languages351–360