@article{DAN_1993_331_6_a3,
     author = {N. A. Zhura},
     title = {A general boundary value problem for higher-order systems that are elliptic in the {Douglis--Nirenberg} sense with constant coefficients in the plane},
     journal = {Doklady Akademii Nauk},
     pages = {668--671},
     publisher = {mathdoc},
     volume = {331},
     number = {6},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_331_6_a3/}
}