@ARTICLE{BorCsu_j1996, author = "Henning~Bordihn and Erzs\'ebet~Csuhaj-Varj\'u", title = "On competence and completeness in {CD} grammar systems", journal = actacybern, year = 1996, volume = 12, number = 4, pages = "347--360", url = {http://www.inf.u-szeged.hu/actacybernetica/vol12n4/bord/bord.xml} }