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@article{TRSPY_1968_96_a10, author = {M. N. Yakovlev}, title = {Nonnegative solutions of systems of nonlinear (in particular, difference) equations}, journal = {Informatics and Automation}, pages = {111--116}, publisher = {mathdoc}, volume = {96}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1968_96_a10/} }
M. N. Yakovlev. Nonnegative solutions of systems of nonlinear (in particular, difference) equations. Informatics and Automation, Автоматическое программирование, численные методы и функциональный анализ, Tome 96 (1968), pp. 111-116. http://geodesic.mathdoc.fr/item/TRSPY_1968_96_a10/