TY - JOUR AU - M. H. Zakhar-Itkin TI - Investigation of a differential equation of Sturm--Liouville type JO - Doklady Akademii Nauk PY - 1964 SP - 1264 EP - 1267 VL - 158 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1964_158_6_a5/ LA - ru ID - DAN_1964_158_6_a5 ER -