@article{TMF_1988_75_2_a4,
     author = {V. I. Savrin and E. M. Shablygin},
     title = {Approximate analytic solution of a~quasipotential equation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {212--217},
     publisher = {mathdoc},
     volume = {75},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_75_2_a4/}
}