@article{VMUMM_1985_2_a20,
     author = {A. S. Faradzhev},
     title = {A problem with an oblique derivative},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {83--85},
     publisher = {mathdoc},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1985_2_a20/}
}