Levelt, Willem J. M. Language Production Group Levelt, MPI for Psycholinguistics, Max Planck Society;
Levelt_Formal_Grammars_Vol2_1974.pdf (Publisher version), 5MB
Levelt, W. J. M. (1974). Formal grammars in linguistics and psycholinguistics: Vol.II, Applications in linguistic theory. The Hague: Mouton.