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Dyfyniad MLAIstre, G R., D F. Welch, M I. Marks, and N. Moyer. Susceptibility of Group A Beta-hemolytic Streptococcus Isolates to Penicillin and Erythromycin. 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.