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@article{DE_1990_26_4_a22, author = {Yu. A. Mamedov}, title = {On the spectrum of ordinary differential pencils}, journal = {Differencialʹnye uravneni\^a}, pages = {712--714}, publisher = {mathdoc}, volume = {26}, number = {4}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1990_26_4_a22/} }
Yu. A. Mamedov. On the spectrum of ordinary differential pencils. Differencialʹnye uravneniâ, Tome 26 (1990) no. 4, pp. 712-714. http://geodesic.mathdoc.fr/item/DE_1990_26_4_a22/