@article{DE_1980_16_2_a9,
     author = {V. I. Bernik and B. I. Ptashnic},
     title = {A boundary value problem for a system of partial differential equations with constant coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {273--279},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_2_a9/}
}