@article{DE_1999_35_1_a8,
     author = {V. A. Erovenko},
     title = {Stability of $L^p$-essential spectra of ordinary differential operators with almost constant coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {58--64},
     publisher = {mathdoc},
     volume = {35},
     number = {1},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_1_a8/}
}