@article{FPM_1997_3_4_a18,
     author = {S. A. Stepin},
     title = {A~model of transition from discrete spectrum to continuous one in the singular perturbation theory},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {1199--1227},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1997_3_4_a18/}
}