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Hueston, W. D., Heider, L. E., Harvey, W. R., & Smith, K. L. (1990). Determinants of high somatic-cell count prevalence in dairy herds practicing teat dipping and dry cow therapy and with no evidence of Streptococcus-agalactiae on repeated bulk tank milk examination. Preventive Veterinary Medicine, 9(2), 131-142.