@article{DE_1985_21_6_a11,
     author = {I. A. Bikchantaev},
     title = {The conjugacy problem for an elliptic system of first-order differential equations with derivatives in the boundary condition},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1007--1013},
     publisher = {mathdoc},
     volume = {21},
     number = {6},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_6_a11/}
}