TY - JOUR AU - P. Olszewski TI - Properties of second-order derivatives of thermal potentials for an equation of parabolic type JO - Differencialʹnye uravneniâ PY - 1984 SP - 844 EP - 851 VL - 20 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1984_20_5_a13/ LA - ru ID - DE_1984_20_5_a13 ER -