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"World Health Organization reference values for human semen characteristics". Human Reproduction Update. 16 (3): 231–45. 2009. doi:10.1093/humupd/dmp048. PMID19934213.
"Novel mutations in ubiquitin-specific protease 26 gene might cause spermatogenesis impairment and male infertility". Asian Journal of Andrology. 9 (6): 809–14. 2007. doi:10.1111/j.1745-7262.2007.00305.x. PMID17968467.
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