Saito, T. R., T. Nishiya, M. Yokosuka, M. Tanaka, and J. Hau. “Competition Between Maternal Nursing Behaviour and Appetitive Behaviour in Lactating Female Rats”. Scandinavian Journal of Laboratory Animal Science, vol. 33, no. 2, Dec. 2006, pp. 111-4, doi:10.23675/sjlas.v33i2.102.