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Bliss EA. Studies upon Minute Hemolytic Streptococci: III. Serological Differentiation. J Bacteriol. 1937 Jun;33(6):625–642.[PMC free article][PubMed]
BOISSARD JM, WORMALD PJ. A new group of haemolytic streptococci for which the designation "group O" is proposed. J Pathol Bacteriol. 1950 Jan;62(1):37–41.[PubMed]
PORTERFIELD JS. Classification of the streptococci of subacute bacterial endocarditis. J Gen Microbiol. 1950 Jan;4(1):92–101.[PubMed]
SELBIE FR, SIMON RD, ROBINSON RHM. Serological classification of viridans streptococci from subacute bacterial endocarditis, teeth, and throats. Br Med J. 1949 Sep 24;2(4629):667–672.[PMC free article][PubMed]