@article{RM_1989_44_3_a1,
     author = {V. I. Gorbachuk and A. V. Knyazyuk},
     title = {Boundary values of solutions of operator-differential equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {67--111},
     publisher = {mathdoc},
     volume = {44},
     number = {3},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1989_44_3_a1/}
}