@article{TMF_1977_32_3_a4,
     author = {K. G. Klimenko and V. E. Rochev},
     title = {Massless limit in~the ladder approximation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {348--353},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_32_3_a4/}
}