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@article{AA_1990_2_5_a0, author = {S. G. Krein and A. I. Tovbis}, title = {Linear singular differential equations in finite-dimensional and {Banach} spaces}, journal = {Algebra i analiz}, pages = {1--62}, publisher = {mathdoc}, volume = {2}, number = {5}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_1990_2_5_a0/} }
S. G. Krein; A. I. Tovbis. Linear singular differential equations in finite-dimensional and Banach spaces. Algebra i analiz, Tome 2 (1990) no. 5, pp. 1-62. http://geodesic.mathdoc.fr/item/AA_1990_2_5_a0/