@article{DE_1975_11_2_a11,
     author = {S. I. Gaiduk},
     title = {A certain mixed problem for a system of equations with piecewise constant coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {309--322},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_2_a11/}
}