@article{DE_1970_6_1_a7,
     author = {R. S. Saks},
     title = {The {Dirichlet} problem for a certain class of elliptic systems of second order differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {72--85},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_1_a7/}
}