Ewing, G. M. (1985). Calculus of variations with applications. New York: Dover Publications.
Παραπομπή Chicago StyleEwing, George M. Calculus of Variations With Applications. New York: Dover Publications, 1985.
Παραπομπή MLAEwing, George M. Calculus of Variations With Applications. New York: Dover Publications, 1985.
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