Sukcharoen, N. (1995). Comparison of Sperm Motility and Sperm Recovery Rate After 40 %/80% and 50%/100% Discontinuous Percoll Gradients Preparation. Thai Journal of Obstetrics and Gynaecology, 7(1), 25–32. retrieved from https://he02.tci-thaijo.org/index.php/tjog/article/view/257763