@article{DAN_1967_172_2_a8,
     author = {M. B. Malyutov},
     title = {Oblique derivative problem in three-dimensional space},
     journal = {Doklady Akademii Nauk},
     pages = {283--286},
     publisher = {mathdoc},
     volume = {172},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_2_a8/}
}