Snoeck, Paola Pereira das Neves, et al. “Effect of Catalase, Superoxide Dismutase and Reduced Glutathione in LDL Extender on Ovine Cryopreserved Sperm Viability”. Semina: Ciências Agrárias, vol. 36, nº 4, agosto de 2015, p. 2593-02, doi:10.5433/1679-0359.2015v36n4p2593.