TY - JOUR AU - P. M. Beletskii TI - Dense subclasses in some varieties of two-step nilpotent groups JO - Sbornik. Mathematics PY - 1985 SP - 369 EP - 385 VL - 50 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_1985_50_2_a4/ LA - en ID - SM_1985_50_2_a4 ER -