@article{INTG_1977_8_a10,
     author = {\`E. G. Poznyak},
     title = {Geometric studies connected with the equation $z_{xy}=\sin z$},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {225--241},
     publisher = {mathdoc},
     volume = {8},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1977_8_a10/}
}