@article{DE_1969_5_1_a2,
     author = {N. E. Tovmasyan},
     title = {Effective methods of solution of the {Dirichlet} problem for elliptic systems of second order differential equations with constant coefficients in regions bounded by an ellipse},
     journal = {Differencialʹnye uravneni\^a},
     pages = {60--71},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_1_a2/}
}