@article{ZVMMF_1971_11_4_a0,
     author = {A. G. Sigalov},
     title = {An equation of continuous descent for the quadratic form of a semi-bounded operator on the unit sphere},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {809--828},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1971_11_4_a0/}
}