@article{MT_1987_7_a10,
     author = {\`E. R. Tsekanovskii},
     title = {The characteristic function and sectorial boundary value problems},
     journal = {Matemati\v{c}eskie trudy},
     pages = {180--194},
     publisher = {mathdoc},
     volume = {7},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1987_7_a10/}
}