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- SOKOLSKI W. T., STAPERT E. M., FERRER E. B. LIQUID NITROGEN FREEZING IN MICROBIOLOGICAL ASSAY SYSTEMS. I. PRESERVATION OF LACTOBACILLUS LEICHMANNII FOR DIRECT USE IN THE VITAMIN B12 ASSAY. Appl Microbiol. 1964 Jul;12:327–329. doi: 10.1128/am.12.4.327-329.1964. [DOI] [PMC free article] [PubMed] [Google Scholar]