@article{SM_1997_188_8_a7,
     author = {V. V. Kornienko},
     title = {On the spectra of first order irregular operator equations},
     journal = {Sbornik. Mathematics},
     pages = {1213--1234},
     publisher = {mathdoc},
     volume = {188},
     number = {8},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1997_188_8_a7/}
}