@article{DAN_1975_222_4_a1,
     author = {A. V. Bitsadze},
     title = {On an equation of the gravitational field},
     journal = {Doklady Akademii Nauk},
     pages = {765--768},
     publisher = {mathdoc},
     volume = {222},
     number = {4},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_222_4_a1/}
}