@article{DAN_1977_233_1_a8,
     author = {S. M. Ponomarev},
     title = {On an eigenvalue problem for the {Lavrent'ev{\textendash}Bicadze} equation},
     journal = {Doklady Akademii Nauk},
     pages = {39--40},
     year = {1977},
     volume = {233},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_233_1_a8/}
}