@article{DAN_1974_219_4_a1,
     author = {B. A. Kats},
     title = {A boundary-value problem with a nonhomeomorphic shift},
     journal = {Doklady Akademii Nauk},
     pages = {781--784},
     publisher = {mathdoc},
     volume = {219},
     number = {4},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_219_4_a1/}
}