@article{DE_1986_22_10_a7,
     author = {I. A. Bikchantaev},
     title = {Boundary value problems for first-order elliptic systems on {Riemann} surfaces},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1732--1738},
     publisher = {mathdoc},
     volume = {22},
     number = {10},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_10_a7/}
}