Candini, P., Moretti, A., Zanella, E., Silveira, P., Viana, C., & Santos, I. (2004). Single or double artificial insemination in fixed time in sows with ovulation induced by Luteinizing Hormon. Brazilian Journal of Veterinary Research and Animal Science, 41(2), 124-130. https://doi.org/10.1590/S1413-95962004000200008