SCHULMAN, N.F., S.M. VIITALA, and J.H. VILKKI. “Quantitative Trait Loci for Udder Conformation and Other Udder Traits in Finnish Ayrshire Cattle”. Agricultural and Food Science 16, no. 2 (January 2, 2007): 170-176. Accessed April 4, 2020. https://journal.fi/afs/article/view/5869.