Lapwood, E. R. (1968). Ordinary differential equations. Pergamon Press.
Lua i Stíl Chicago (17ú heag.)Lapwood, E. R. Ordinary Differential Equations. Oxford, Sydney: Pergamon Press, 1968.
Lua MLA (8ú heag.)Lapwood, E. R. Ordinary Differential Equations. Pergamon Press, 1968.
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