@article{TRSPY_1971_116_a13,
     author = {N. N. Ural'tseva},
     title = {Nonlinear boundary value problems for equations of minimal surface type},
     journal = {Informatics and Automation},
     pages = {217--226},
     publisher = {mathdoc},
     volume = {116},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1971_116_a13/}
}