Asadpour, Reza, et al. “Activity of Antioxidant Enzymes and Malondialdehyde in Seminal Plasma and Their Relationship With Semen Characteristics in Crossbred Rams”. The Indian Journal of Animal Sciences, vol. 82, no. 7, July 2012, https://epubs.icar.org.in/index.php/IJAnS/article/view/21754.