@article{DAN_1961_138_3_a5,
     author = {M. I. Vishik},
     title = {Boundary-value problems for quasilinear strongly elliptic systems of equations having divergence form},
     journal = {Doklady Akademii Nauk},
     pages = {518--521},
     publisher = {mathdoc},
     volume = {138},
     number = {3},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_138_3_a5/}
}