Kunathikom , S., Makemaharn, O., Suteewan, T., Suksompong, S. and Julavijitphong, S. (1999) “Nuclear DNA Normality of Spermatozoa Selected by Swim-up and Two-layer Percoll Gradient Techniques”, Thai Journal of Obstetrics and Gynaecology. Bangkok, Thailand, 11(1), pp. 43–47. available at: https://he02.tci-thaijo.org/index.php/tjog/article/view/257187 (accessed: 28 September 2026).