@article{TMF_1974_19_2_a8,
     author = {P. V. Elyutin and V. D. Krivchenkov},
     title = {On~the applicability of the quasiclassical approximation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {233--236},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_19_2_a8/}
}