TY - JOUR AU - D. Szynal AU - A. Wolińska TI - On classes of couples of characteristic furictions satisfying the condition of Dugué JO - Commentationes Mathematicae PY - 1983 SP - 325 EP - 328 VL - 23 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.14708/cm.v23i2.6068/ DO - 10.14708/cm.v23i2.6068 LA - pl ID - 10_14708_cm_v23i2_6068 ER -