@article{DAN_1990_310_6_a4,
     author = {E. V. Radkevich},
     title = {An operator pencil for the {Verigin} contact problem},
     journal = {Doklady Akademii Nauk},
     pages = {1303--1307},
     publisher = {mathdoc},
     volume = {310},
     number = {6},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_310_6_a4/}
}