@article{TMF_1985_64_2_a10,
     author = {S. P. Andreev and B. M. Karnakov and V. D. Mur},
     title = {Energy spectrum of a~particle in potentials with strongly differing ranges},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {287--298},
     year = {1985},
     volume = {64},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1985_64_2_a10/}
}