Kells, l. M. (1947). Elementary differential equations. New York: McGraw-Hill.
Trích dẫn kiểu ChicagoKells, lyman M. Elementary Differential Equations. New York: McGraw-Hill, 1947.
Deismireacht MLAKells, lyman M. Elementary Differential Equations. New York: McGraw-Hill, 1947.
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