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