@article{DAN_1992_326_5_a1,
     author = {G. V. Demidenko},
     title = {Integral operators defined by boundary value problems for},
     journal = {Doklady Akademii Nauk},
     pages = {765--769},
     publisher = {mathdoc},
     volume = {326},
     number = {5},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_326_5_a1/}
}