@article{ZVMMF_1977_17_2_a12,
     author = {V. P. Gorelov and V. I. Il'in},
     title = {A correct asymptotic multigroup approximation in the problem of finding the critical radius of a sphere},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {420--427},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1977_17_2_a12/}
}