TY - JOUR AU - A. A. Bel'skii TI - Integral rings of groups of period two and generalizations of Witt rings JO - Matematičeskie zametki PY - 1973 SP - 311 EP - 315 VL - 13 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1973_13_2_a16/ LA - ru ID - MZM_1973_13_2_a16 ER -