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@article{DAN_1985_284_5_a1, author = {V. S. Belonosov}, title = {Indices of instability of differential operators}, journal = {Doklady Akademii Nauk}, pages = {1037--1041}, publisher = {mathdoc}, volume = {284}, number = {5}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1985_284_5_a1/} }
V. S. Belonosov. Indices of instability of differential operators. Doklady Akademii Nauk, Tome 284 (1985) no. 5, pp. 1037-1041. http://geodesic.mathdoc.fr/item/DAN_1985_284_5_a1/