Selenium in blood, semen, seminal plasma and spermatozoa of stallions and its relationship to sperm quality - Bertelsmann, H; Keppler, S; Höltershinken, M; Bollwein, H; Behne, D; Alber, D; Bukalis, G; Kyriakopoulos, A; Sieme, H (Reprod Fertil Dev, 2010)