Korsten, P., Clutton-Brock, T., Pilkington, J. G., Pemberton, J. M., & Kruuk, L. E. B. (2009). Sexual conflict in twins: Male co-twins reduce fitness of female Soay sheep. The Royal Society.

Korsten, Peter, Tim Clutton-Brock, Jill G. Pilkington, Josephine M. Pemberton, e Loeske E. B. Kruuk. Sexual Conflict in Twins: Male Co-twins Reduce Fitness of Female Soay Sheep. The Royal Society, 2009.

Korsten, Peter, et al. Sexual Conflict in Twins: Male Co-twins Reduce Fitness of Female Soay Sheep. The Royal Society, 2009.