@article{ZNSL_1973_38_a6,
     author = {A. P. Oskolkov},
     title = {Uniqueness and global solvability for boundary-value problems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {98--136},
     year = {1973},
     volume = {38},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1973_38_a6/}
}