@article{MT_1985_6_a3,
     author = {V. I. Kostin and Sh. I. Razzakov},
     title = {Convergence of the orthogonal-power method of calculation of a spectrum},
     journal = {Matemati\v{c}eskie trudy},
     pages = {55--84},
     publisher = {mathdoc},
     volume = {6},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1985_6_a3/}
}