@article{DAN_1986_287_6_a0,
     author = {Sh. A. Alimov},
     title = {A spectral problem of {Bitsadze--Samarskii}},
     journal = {Doklady Akademii Nauk},
     pages = {1289--1290},
     publisher = {mathdoc},
     volume = {287},
     number = {6},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_287_6_a0/}
}