Henning Bordihn Jürgen Dassow György Vaszil Grammar Systems as Language Analyzers and Recursively Enumerable Languages. 136-147 http://link.springer.de/link/service/series/0558/bibs/1684/16840136.htm 1999 conf/fct/1999 FCT db/conf/fct/fct99.html#BordihnDV99