TY - JOUR AU - Havel, Václav TI - Construction of certain systems with two compositions JO - Commentationes Mathematicae Universitatis Carolinae PY - 1965 SP - 413 EP - 428 VL - 06 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMUC_1965__6_4_a3/ LA - en ID - CMUC_1965__6_4_a3 ER -