Kells, L. M. (1954). Elementary differential equations (4a. ed.). McGraw-Hill.
Chicago Style (17th ed.) CitationKells, Lyman Morse. Elementary Differential Equations. 4a. ed. Nueva York: McGraw-Hill, 1954.
MLA (9th ed.) CitationKells, Lyman Morse. Elementary Differential Equations. 4a. ed. McGraw-Hill, 1954.
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