TY - JOUR AU - V. P. Serebryakov TI - Quasiregularity conditions for a~``Pure imaginary'' singular differential operator of the third order JO - Matematičeskie zametki PY - 1997 SP - 149 EP - 151 VL - 61 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1997_61_1_a14/ LA - ru ID - MZM_1997_61_1_a14 ER -