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2. Cobalt in Cows’ Milk
3. Occurrence of Different Beta-Lactoglobulins in Cow's Milk
4. Aschaffenburg, R. & Rowland, S. J. (1950). Chem. & Ind. (Rev.) p. 636.
5. Babcock, S. M. (1892). Wis. agric. Exp. Sta. Ann. Rep. 1891, No. 8, p. 292.