Kells, L. M. (1954). Elementary Differential Equations. New York: McGraw-Hill.
Trích dẫn kiểu ChicagoKells, Lyman M. Elementary Differential Equations. New York: McGraw-Hill, 1954.
Deismireacht MLAKells, Lyman M. Elementary Differential Equations. New York: McGraw-Hill, 1954.
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