Nurcholis, Nurcholis, et al. “Supplementation of Pandanus Conoideus Oil in Cryopreservation Diluents for Maintaining the Semen Quality of Ongole Grade Bull”. Tropical Animal Science Journal, vol. 44, no. 2, May 2021, pp. 146-51, https://doi.org/10.5398/tasj.2021.44.2.146.