@article{TMF_1976_28_2_a8,
     author = {A. A. Atanasov},
     title = {Solution of variable phase equation with singular potentials by means of formal series},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {232--239},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1976_28_2_a8/}
}