@article{ZNSL_1991_190_a4,
     author = {O. V. Ivanov},
     title = {Fatou theorem on nontangential limits and questions of extension on the ideal boundary},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {101--109},
     publisher = {mathdoc},
     volume = {190},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_190_a4/}
}