ELSGOLC, L. (1961). Calculus of variations. Pergamon Press.
Tohutoru Kātū Chicago (17th ed.)ELSGOLC, L.E. Calculus of Variations. Oxford: Pergamon Press, 1961.
Tohutoro MLA (9th ed.)ELSGOLC, L.E. Calculus of Variations. Pergamon Press, 1961.
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