1. Aakvaag A, Bental O, Quigstad K, Walstad P, Ronningen H, Fonnum F: Testosterone and testosterone binding globuline (TeBG) in young men during prolonged stress. Int. J. Andr. 1978, 1, 22–31.
2. Amann RP: How a bull works. Proc. 11th. Technical Conference on Artificial Insemination and Reproduction. 1986, pp. 6–18.
3. Bellvé AR, Zheng W: Growth factors as autocrine and paracrine mediators of male gonadal function. J. Reprod. Fert. 1989,85, 771–793.
4. Blanchard TL, Varner DD, Bretzlaff KN, Elmore RG: The causes and pathologic changes of testicular degeneration in large animals. Vet. Med. 1991a, 86, 531–536.
5. Blanchard TL, Varner DD, Bretzlaff KN, Elmore RG: Testicular degeneration in large animals: Identification and treatment. Vet. Med. 1991b, 86, 537–542.