Manoch, Darapa, Somboon Kunathikom, Thaweephong Thaweechaithaworn, Phattaraphum Phophong, and Pitak Laokirkkiat. “Hypoosmotic Swelling Test of Sperm Supplemented with Pentoxifylline after Preparation by Two-layer Percoll Gradient Method”. Siriraj Medical Journal 56, no. 4 (April 1, 2004): 186–190. accessed September 29, 2026. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245508.