[1] Effect of Casein, Lactalbumin, and Ovalbumin on 3-Methylcholanthrene-Induced Mammary Carcinoma in Rats. doi: 10.1093/jnci/33.2.243

[2] Effects of Varying the Proportion of Protein in the Diet. http://cancerres.aacrjournals.org/content/9/3/162.short

[3]The combined effects of dietary protein and fat on 7,12-dimethylbenz(a)anthracene-induced breast cancer in rats. http://jn.nutrition.org/content/114/7/1213.long