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@article{TRSPY_1949_28_a6, author = {L. V. Kantorovich}, title = {On differential equations of the form $x''=f(x)$}, journal = {Informatics and Automation}, pages = {148--151}, publisher = {mathdoc}, volume = {28}, year = {1949}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1949_28_a6/} }
L. V. Kantorovich. On differential equations of the form $x''=f(x)$. Informatics and Automation, Collected works on approximation analysis of the Leningrad Branch of the Institute, Tome 28 (1949), pp. 148-151. http://geodesic.mathdoc.fr/item/TRSPY_1949_28_a6/