Gelfand, I., & Fomin, S. (1963). Calculus of variations. Prentice - Hall.
Chicago Style aipamenaGelfand, I.M, and S.V Fomin. Calculus of Variations. Prentice - Hall, 1963.
MLA aipamenaGelfand, I.M, and S.V Fomin. Calculus of Variations. Prentice - Hall, 1963.
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