TY - JOUR AU - Yu. T. Sil'chenko TI - Second order equations with operators that generate semigroups with singularities JO - Differencialʹnye uravneniâ PY - 1977 SP - 763 EP - 765 VL - 13 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1977_13_4_a26/ LA - ru ID - DE_1977_13_4_a26 ER -