@article{DE_1993_29_11_a14,
     author = {E. I. Kaikina and I. A. Shishmarev},
     title = {A periodic problem for a nonlinear nonlocal {Schr\"odinger} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1996--1998},
     publisher = {mathdoc},
     volume = {29},
     number = {11},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_11_a14/}
}