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References
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Potter, L. M., Schmidt, G. P., Blair, M. E., Shelton, J. R. & Bliss, B. A. Animal Nutrition and Health, March–April (1984).
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PARKS, J. Biology's variable logic. Nature 351, 434 (1991). https://doi.org/10.1038/351434a0
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DOI: https://doi.org/10.1038/351434a0