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@article{MMO_1971_25_a4, author = {A. D. Bruno}, title = {Analytic form of differential {equations.~I,~II}}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {119--262}, publisher = {mathdoc}, volume = {25}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1971_25_a4/} }
A. D. Bruno. Analytic form of differential equations.~I,~II. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 25 (1971), pp. 119-262. http://geodesic.mathdoc.fr/item/MMO_1971_25_a4/