@article{SM_1972_18_4_a4,
     author = {N. E. Tovmasyan},
     title = {On a~method of solving boundary value problems for elliptic systems of second-order differential equations in the plane},
     journal = {Sbornik. Mathematics},
     pages = {603--620},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1972_18_4_a4/}
}