@article{ZVMMF_1992_32_12_a13,
     author = {S. V. Kurochkin},
     title = {The discrete character of the spectrum of a linear two-point boundary-value problem with constraints at singular points},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1995--2000},
     publisher = {mathdoc},
     volume = {32},
     number = {12},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1992_32_12_a13/}
}