@article{DAN_1972_204_5_a0,
     author = {A. V. Bitsadze},
     title = {On a system of linear partial differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {1031--1033},
     publisher = {mathdoc},
     volume = {204},
     number = {5},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_204_5_a0/}
}