@article{TRSPY_1973_125_a13,
     author = {L. Stupyalis},
     title = {Boundary value problems for elliptic-hyperbolic equations},
     journal = {Informatics and Automation},
     pages = {211--229},
     publisher = {mathdoc},
     volume = {125},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1973_125_a13/}
}