On the structure of recognizable languages of dependence graphs A. Ehrenfeucht; H. J. Hoogeboom; G. Rozenberg — 1993 RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
Coordinated pair systems ; part II : sparse structure of Dyck words and Ogden's lemma A. Ehrenfeucht; H. J. Hoogeboom; G. Rozenberg — 1986 RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
Coordinated pair systems ; part I : Dyck works and classical pumping A. Ehrenfeucht; H. J. Hoogeboom; G. Rozenberg — 1986 RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications