Ovsiannikov, L. V. (1982). Group analysis of differential equations. Academic Press.
शिकागो स्टाइल उद्धरणOvsiannikov, L V. Group Analysis of Differential Equations. New York: Academic Press, 1982.
एमएलए उद्धरणOvsiannikov, L V. Group Analysis of Differential Equations. Academic Press, 1982.
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