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Dyfyniad Arddull ChicagoYorke, J.A. ed. Seminar on Differential Equations and Dynamical Systems. III. Berlin: Springer-Verlag, 1970.
Dyfyniad MLAYorke, J.A. ed. Seminar on Differential Equations and Dynamical Systems. III. Springer-Verlag, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.