@article{DAN_1987_297_6_a14,
     author = {Yu. K. Sirenko and V. P. Shestopalov},
     title = {Isolation of the physical solutions of problems in the theory of},
     journal = {Doklady Akademii Nauk},
     pages = {1346--1350},
     publisher = {mathdoc},
     volume = {297},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_297_6_a14/}
}