TY - JOUR AU - V. V. Tolmachev TI - The shift of the branch point in the mass operator of formal perturbation theory for a nonideal Fermi--Dirac system JO - Doklady Akademii Nauk PY - 1961 SP - 829 EP - 832 VL - 141 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1961_141_4_a16/ LA - ru ID - DAN_1961_141_4_a16 ER -