@article{SM_1971_13_1_a2,
     author = {M. S. Agranovich},
     title = {Boundary value problems for systems with a~parameter},
     journal = {Sbornik. Mathematics},
     pages = {25--64},
     year = {1971},
     volume = {13},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_13_1_a2/}
}