Gonczarowski, J., H. C. M. Kleijn, and Grzegorz Rozenberg. “Grammatical Constructions in Selective Substitution Grammars”. Acta Cybernetica 6, no. 3 (January 1, 1983): 239-269. Accessed April 26, 2024. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3256.