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Dyfyniad Arddull ChicagoRao, K. Sankara. Introduction to Partial Differential Equations. NewDelhi: Prentice Hall of India, 1997.
Dyfyniad MLARao, K. Sankara. Introduction to Partial Differential Equations. Prentice Hall of India, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.