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@article{DAN_1965_165_3_a2, author = {M. A. Gol'dman and S. N. Krachkovskii}, title = {The $d$-characteristic of a linear operator}, journal = {Doklady Akademii Nauk}, pages = {476--478}, publisher = {mathdoc}, volume = {165}, number = {3}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1965_165_3_a2/} }
M. A. Gol'dman; S. N. Krachkovskii. The $d$-characteristic of a linear operator. Doklady Akademii Nauk, Tome 165 (1965) no. 3, pp. 476-478. http://geodesic.mathdoc.fr/item/DAN_1965_165_3_a2/