TY - JOUR AU - A. A. Atanasov TI - Solution of variable phase equation with singular potentials by means of formal series JO - Teoretičeskaâ i matematičeskaâ fizika PY - 1976 SP - 232 EP - 239 VL - 28 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_1976_28_2_a8/ LA - ru ID - TMF_1976_28_2_a8 ER -