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Kamitsuka PS, et al. Production and standardization of ECHO reference antisera. I. For 25 prototypic ECHO viruses. Am. J. Hyg. 74: 7-25, 1961. PubMed: 13751052

Hara M, et al. Lack of serological relationship of ECHO virus types 1 and 12. Proc. Soc. Exp. Biol. Med. 128: 683-687, 1968. PubMed: 4970077