TY - JOUR AU - W. Waliszewski TI - Inductive definitions JO - Commentationes Mathematicae PY - 1968 SP - 19 EP - 22 VL - 11 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.14708/cm.v11i1.5598/ DO - 10.14708/cm.v11i1.5598 LA - pl ID - 10_14708_cm_v11i1_5598 ER -