TY - JOUR AU - M. A. Mustafin TI - A condition for the basis of summation by the Abel method of series in root vectors of the nonselfadjoint Sturm--Liouville operator JO - Differencialʹnye uravneniâ PY - 1993 SP - 116 EP - 117 VL - 29 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1993_29_1_a14/ LA - ru ID - DE_1993_29_1_a14 ER -