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@article{DE_1993_29_10_a11, author = {V. M. Savchin}, title = {On the structure of variational equations with symmetric operator $d/dt$}, journal = {Differencialʹnye uravneni\^a}, pages = {1765--1771}, publisher = {mathdoc}, volume = {29}, number = {10}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1993_29_10_a11/} }
V. M. Savchin. On the structure of variational equations with symmetric operator $d/dt$. Differencialʹnye uravneniâ, Tome 29 (1993) no. 10, pp. 1765-1771. http://geodesic.mathdoc.fr/item/DE_1993_29_10_a11/