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. 11, 1 (Mar. 1999), 43–47.