Vahidi, S., M. Reza Moein, F. Yazdinejad, S. Ghasemi-Esmailabad, and N. Narimani. “Iranian Temporal Changes in Semen Quality During the past 22 Years: A Report from an Infertility Center”. International Journal of Reproductive BioMedicine (IJRM), Vol. 18, no. 12, Dec. 2020, pp. 1059–1064, doi:10.18502/ijrm.v18i12.8027.