1. Cancellations in linear conrtext-free languages;Brandenburg,1989
2. On cooperating/distributed grammar systems:;Csuhaj-Varjú;J. Inform. Process. Cybernet. EIK,1990
3. Cooperating grammar systems: a syntactical framework for the blackboard model of problem solving;Csuhaj-Varjú,1989
4. Grammars with context dependency restricted to synchronization;Geffert,1986
5. Context-free like forms fro the phase-stru ture grammars;Geffert,1988