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Dyfyniad Arddull ChicagoSauvigny, Friedrich. Partial Differential Equations. New Delhi: Springer (India), 2012.
Dyfyniad MLASauvigny, Friedrich. Partial Differential Equations. Springer (India), 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.