@article{DAN_1990_311_1_a0,
     author = {A. V. Bitsadze},
     title = {On the {Neumann} problem for harmonic functions},
     journal = {Doklady Akademii Nauk},
     pages = {11--13},
     publisher = {mathdoc},
     volume = {311},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_1_a0/}
}