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Dyfyniad Arddull ChicagoSteinmann, Othmar. Perturbation Expansions in Axiomatic Field Theory. New York: Springer-Verlag, 1971.
Dyfyniad MLASteinmann, Othmar. Perturbation Expansions in Axiomatic Field Theory. Springer-Verlag, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.