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@article{DE_1965_1_8_a0, author = {I. T. Kiguradze}, title = {On the question of variability of solutions of nonlinear differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {995--1006}, publisher = {mathdoc}, volume = {1}, number = {8}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1965_1_8_a0/} }
I. T. Kiguradze. On the question of variability of solutions of nonlinear differential equations. Differencialʹnye uravneniâ, Tome 1 (1965) no. 8, pp. 995-1006. http://geodesic.mathdoc.fr/item/DE_1965_1_8_a0/