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Warseck M, Ray B, Speck ML.Warseck M, et al. Among authors: speck ml.Appl Microbiol. 1973 Dec;26(6):919-24. doi: 10.1128/am.26.6.919-924.1973.Appl Microbiol. 1973.PMID: 4588199Free PMC article.
Ray B, Speck ML.Ray B, et al. Among authors: speck ml.Appl Environ Microbiol. 1978 Apr;35(4):820-2. doi: 10.1128/aem.35.4.820-822.1978.Appl Environ Microbiol. 1978.PMID: 348110Free PMC article.