1. Bane, A. & L. Nicander: Pouch formations by invaginations of the nuclear envelope of bovine and porcine sperm as a sign of disturbed spermiogenesis. Nord. Vet.-Med. 1965, 17, 628–632.
2. Cameron, R. D. A. & A. W. Blackshaw: The effect of elevated ambient temperature on spermatogenesis in the boar. J. Reprod. Fert. 1980, 59, 173–179.
3. Christenson, R. K., H. S. Teague, A. P. Grifo Jr & W. L. Roller: The effect of high environmental temperature on the boar. Ohio Swine Research and Information Report 1972, p. 19–23.
4. Einarsson, S.: Factors affecting fertility in artificial insemination of swine. Nord. Vet.-Med. 1968, 20, 622–629.
5. Einarsson, S. & K. Larsson: Endocrine effects of elevated ambient temperature in boars. Proc. IXth Int. Congr. Anim. Reprod. & AI., Madrid, 1980, IV, 736–740.