@article{FAA_1979_13_3_a11,
     author = {S. Yu. Dobrokhotov and V. P. Maslov},
     title = {Problem of reflection from a boundary for the equation $h^2\square u+{\cyra}\operatorname{sh}u=0$ and finite-zone conditionally periodic solutions},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {79--80},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1979_13_3_a11/}
}