@article{TSP_2011_28_28_a4,
     author = {K. A. Darovskaya and A. L. Skubachevsky},
     title = {A spectral problem with integral conditions},
     journal = {Trudy Seminara im. I.G. Petrovskogo},
     pages = {147--160},
     publisher = {mathdoc},
     volume = {28},
     number = {28},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TSP_2011_28_28_a4/}
}