1. Baccetti B. Evolutionary trends in sperm structure. Comparative Biochemistry and Physiology. A, Comparative Physiology. 1986;85(1):29-36
2. Roosen-Runge E. The process of spermatogenesis in mammals. In: Developmental and Cell Biology Series. Vol. 10. CUP Archive; 1977
3. Segal S. Sexual differentiation in vertebrates. In: MBL Lectures in Biology, vol. 7: The Origin and Evolution of Sex. 1985. pp. 263-270
4. Surani MA, Allen ND, Barton SC, Fundele R, Howlett SK, Norris ML, et al. Developmental consequences of imprinting of parental chromosomes by DNA methylation. Philosophical Transactions of the Royal Society B. 1990;326(1235):313-327
5. Kelly TL, Trasler JM. Reproductive epigenetics: Section Editors: Roderick R. McInnes, e-mail: mcinnes@ sickkids.on.ca Jacques Michaud, e-mail: jmichaud@ justine.umontreal.ca. Clinical Genetics. 2004;65(4):247-260