Calculus of Variations and Partial Differential Equations. Springer Berlin Heidelberg.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCalculus of Variations and Partial Differential Equations. Springer Berlin Heidelberg.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCalculus of Variations and Partial Differential Equations. Springer Berlin Heidelberg.
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