Pereira, Rodrigo Junqueira, et al. “Covariance Functions for Test-Day Milk Yield in Gir Cattle”. Pesquisa Agropecuaria Brasileira, vol. 45, no. 11, Jan. 2011, pp. 1303-11, doi:10.1590/S1678-3921.pab2010.v45.9363.