Simmons, G. F. (1991). Differential equations with applications and historical notes. New York: McGraw Hill.
Παραπομπή Chicago StyleSimmons, George F. Differential Equations With Applications and Historical Notes. New York: McGraw Hill, 1991.
Παραπομπή MLASimmons, George F. Differential Equations With Applications and Historical Notes. New York: McGraw Hill, 1991.
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