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2. Disorders of the reproductive systems;London,1987
3. Male reproductive function and the composition of semen: general considerations;Mann,1981
4. Intervention probable du zinc dans les phenomenes de fecondation chez les animaux vertebres;Bertrand;C R Acad Sci [III],1921
5. A comparative study of seminal trace elements in fertile and infertile men;Umeyama;Fertil Steril,1986