%0 Journal Article %A A. A. Atanasov %T Solution of variable phase equation with singular potentials by means of formal series %J Teoretičeskaâ i matematičeskaâ fizika %D 1976 %P 232-239 %V 28 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1976_28_2_a8/ %G ru %F TMF_1976_28_2_a8