@article{DE_1980_16_1_a8,
     author = {V. V. Kibirev},
     title = {On the oblique derivative problem with linear coefficients for harmonic functions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {80--85},
     year = {1980},
     volume = {16},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_1_a8/}
}