Bjork, A., Starmer, W. T., Higginson, D. M., Rhodes, C. J., & Pitnick, S. (2007). Complex interactions with females and rival males limit the evolution of sperm offence and defence. The Royal Society.

Bjork, Adam, William T. Starmer, Dawn M. Higginson, Christopher J. Rhodes, ja Scott Pitnick. Complex Interactions With Females and Rival Males Limit the Evolution of Sperm Offence and Defence. The Royal Society, 2007.

Bjork, Adam, et al. Complex Interactions With Females and Rival Males Limit the Evolution of Sperm Offence and Defence. The Royal Society, 2007.