R. H. Alvarez, A. C. Martinez, J. B. P. de Carvalho, J. R. P. Arcaro, R. M. L. Pires, and C. A. de Oliveira, “Efficacy of the Ovsynch treatment associated to fixed-time artificial insemination in Bos taurus and Bos indicus herds”, PAB, vol. 38, no. 2, pp. 317–323, Feb. 2003.