@article{ITA_1986__20_4_425_0,
     author = {Ehrenfeucht, A. and Hoogeboom, H. J. and Rozenberg, G.},
     title = {Coordinated pair systems ; part {II} : sparse structure of {Dyck} words and {Ogden's} lemma},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {425--439},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {20},
     number = {4},
     year = {1986},
     mrnumber = {880845},
     zbl = {0639.68076},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1986__20_4_425_0/}
}