@article{TMF_1974_18_3_a8,
     author = {Yu. I. Polyakov},
     title = {Algorithm of {Rayleigh{\textendash}Schr\"odinger} perturbation theory for hermitian operators},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {374--382},
     year = {1974},
     volume = {18},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_18_3_a8/}
}