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Association between milk protein genetic variants and genetic values of Canadian Holstein bulls for milk yield traits.
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Casein polymorphism and relation between milk production traits.
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Milk Protein Polymorphisms in California Dairy Cattle.
Alison van Eenennaam and Juan Fernando Medrano. (1991). J Dairy Sci 74:1730-1742

Associations between β-casein genotype and milk yield and composition in grazing dairy cows
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Milk protein loci polymorphism in taurine (Bos taurus) and zebu (Bos indicus) populations bred in hot climate.
G. Ceriotti, D. Marletta, A. Caroli, G. Erhardt. (2004). Journal of Animal Breeding and Genetics 121 (6), 404– 415.