@article{IM2_1989_32_1_a6,
     author = {S. E. Cheremshantsev},
     title = {Expansion in eigenfunctions of a~nonselfadjoint operator with purely continuous spectrum},
     journal = {Izvestiya. Mathematics},
     pages = {113--139},
     year = {1989},
     volume = {32},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1989_32_1_a6/}
}