Pornwiroon, S., C. Getpook, and A. Geater. “Can Pentoxifylline-Supplemented Cryoprotectant Improve Human Sperm Motility After Cryopreservation?”. Thai Journal of Obstetrics and Gynaecology, vol. 15, no. 3, Apr. 2017, pp. 181-4, https://he02.tci-thaijo.org/index.php/tjog/article/view/83366.