References
- Rosenkrantz , D. J. 1969 . Programmed grammars and classes of formal languages . J. Assoc.Comput. Mach. , 16
- Rosenberg , G. 1973 . Extension of Tabled OL-Systems and languages . Inter. Jour. of Comp. and Inform. Sciences , 2 ( 4 ) December
- Von Solms , S. H. 1975 . On TOL-languages over terminals . Information Processing Letters , 3 ( 3 ) Jan
- Asveld , P. R. J. “ On some controlled ETOL-systems and languages. Part I ” . In Technische Hogeschool Twente Vol. 59 , Enschede, , Netherlands Memorandum NR