TY - JOUR AU - J. Gilewski TI - Generalized convolutions and delphic semigroups JO - Colloquium Mathematicum PY - 1972 SP - 281 EP - 289 VL - 25 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-25-2-281-289/ DO - 10.4064/cm-25-2-281-289 LA - en ID - 10_4064_cm_25_2_281_289 ER -