@article{DE_1997_33_7_a0,
     author = {V. A. Erovenko},
     title = {Application of the abstract theory of perturbations to the investigation of essential spectra of ordinary differential operators in $L^p$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {867--875},
     publisher = {mathdoc},
     volume = {33},
     number = {7},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_7_a0/}
}