@article{ZNSL_1991_198_a4,
     author = {A. P. Oskolkov},
     title = {Nonlocal problems for some class nonlinear operator equations arising in the theory {Sobolev} type equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {31--48},
     publisher = {mathdoc},
     volume = {198},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_198_a4/}
}