Lagrotta, Marcos Rodrigues, et al. “Relationship Between Morphological Traits and Milk Yield in Gir Breed Cows”. Pesquisa Agropecuaria Brasileira, vol. 45, no. 4, Jan. 2011, pp. 423-9, doi:10.1590/S1678-3921.pab2010.v45.3115.