@article{ZNSL_1979_84_a6,
     author = {A. V. Ivanov},
     title = {The first boundary value problem for $(A,\vec b)$-elliptic equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {45--88},
     publisher = {mathdoc},
     volume = {84},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_84_a6/}
}