@article{DAN_1984_276_6_a10,
     author = {Ya. A. Roitberg and Z. G. Sheftel},
     title = {General boundary value problems for systems with strong degeneration which are elliptic in the sense of {Douglis--Nirenberg}},
     journal = {Doklady Akademii Nauk},
     pages = {1324--1327},
     publisher = {mathdoc},
     volume = {276},
     number = {6},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_276_6_a10/}
}