Tofigh Hesabee, S., Nasr- Esfahani, M., Razavi, S., Mardani, M. (2002). 'Efficiency Of Sil-Select And Percoll To Recover Sperm With Normal Chromatin And Morphology And Effect Of These Parameters On Fertilization, Embryo Quality And Cleavage Score', Cell Journal (Yakhteh), 4(3), pp. 133-139.