@article{ZVMMF_1961_1_4_a11,
     author = {L. T. Savinova},
     title = {On lower estimates for the eigenvalues of positive operators},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {714--719},
     year = {1961},
     volume = {1},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1961_1_4_a11/}
}