@article{TMF_1974_21_2_a7,
     author = {A. I. Sherstyuk},
     title = {Determination of closed expressions for the perturbation theory corrections to the wave functions of bound states by means of {a~Sturm} function expansion},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {224--232},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_21_2_a7/}
}