Não informado. (1988). Differential and integral equations. Ohio University, Department of Mathematics.
Chicago-referens (17:e uppl.)Não informado. Differential and Integral Equations. Athens, Ohio: Ohio University, Department of Mathematics, 1988.
MLA-referens (8:e uppl.)Não informado. Differential and Integral Equations. Ohio University, Department of Mathematics, 1988.
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