TY - JOUR AU - Ježek, Jaroslav TI - Principal dual ideals in lattices of primitive classes JO - Commentationes Mathematicae Universitatis Carolinae PY - 1968 SP - 533 EP - 545 VL - 09 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMUC_1968__9_4_a3/ LA - en ID - CMUC_1968__9_4_a3 ER -