Al-Dujaily, Saad S., et al. “Effect of maca(Lepidium Meyenii) Aqueous Extract on the Epididymal Sperms Quality and the DNA Normality of Vasectomized Mature mice:Model Forobstructive Azoospermia in Men”. Journal of Biotechnology Research Center, vol. 12, no. 2, June 2018, pp. 73-81, doi:10.24126/jobrc.2018.12.2.541.