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Dyfyniad Arddull ChicagoNagle, R. Kent, E. B. Saff, and Arthur David Snider. Fundamentals of Differential Equations and Boundary Value Problems. 3rd ed. Reading, Mass.: Addison-Wesley, 2000.
Dyfyniad MLANagle, R. Kent, et al. Fundamentals of Differential Equations and Boundary Value Problems. 3rd ed. Addison-Wesley, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.