@article{DE_1984_20_6_a10,
     author = {V. S. Il'kiv and B. I. Ptashnic},
     title = {A problem with nonlocal boundary conditions for systems of partial differential equations with constant coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1012--1023},
     publisher = {mathdoc},
     volume = {20},
     number = {6},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_6_a10/}
}