@article{RM_1994_49_1_a7,
     author = {V. V. Dubrovskii and V. F. Kravchenko},
     title = {An approach to solving interior spectral boundary-value problems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {227--228},
     publisher = {mathdoc},
     volume = {49},
     number = {1},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1994_49_1_a7/}
}