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Dyfyniad Arddull ChicagoEckhaus, W. Studies in Non-linear Stability Theory. Berlin, New York: Springer-Verlag, 1965.
Dyfyniad MLAEckhaus, W. Studies in Non-linear Stability Theory. Springer-Verlag, 1965.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.