@article{ZNSL_1979_92_a8,
     author = {A. V. Ivanov},
     title = {The first and second boundary value problems for $(A,\vec b)$-elliptic equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {171--181},
     publisher = {mathdoc},
     volume = {92},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_92_a8/}
}