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Dyfyniad Arddull ChicagoRotman, Joseph J. An Introduction to the Theory of Groups. 4th ed. New York: Springer, 1995.
Dyfyniad MLARotman, Joseph J. An Introduction to the Theory of Groups. 4th ed. Springer, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.