TY - JOUR AU - D. L. Berman TI - Extremal problems in the theory of polynomial operations JO - Doklady Akademii Nauk PY - 1966 SP - 13 EP - 16 VL - 170 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1966_170_1_a1/ LA - ru ID - DAN_1966_170_1_a1 ER -