@article{DAN_1963_149_2_a0,
     author = {M. S. Agranovich and M. I. Vishik},
     title = {Elliptic boundary-value problems depending on a parameter},
     journal = {Doklady Akademii Nauk},
     pages = {223--226},
     publisher = {mathdoc},
     volume = {149},
     number = {2},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_149_2_a0/}
}