Markley, N. G. (2004). Principles of differential equations. New Jersey: Willey.
Trích dẫn kiểu ChicagoMarkley, Nelson G. Principles of Differential Equations. New Jersey: Willey, 2004.
Deismireacht MLAMarkley, Nelson G. Principles of Differential Equations. New Jersey: Willey, 2004.
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