@article{DAN_1977_236_6_a6,
     author = {R. S. Saks},
     title = {Boundary value problems for weakly elliptic systems of differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {1311--1314},
     publisher = {mathdoc},
     volume = {236},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_236_6_a6/}
}