@article{articlea312720c,
title   = {Milk yield, residual milk, oxytocin and cortisol release during machine milking in Gir, Gir × Holstein and Holstein cows},
author = {Negrão, João Alberto and Marnet, Pierre-Guy},
year = {2006},
doi = {10.1051/rnd:2005068},
journal   = {Reproduction Nutrition Development}
}