Sachser, N.; Schwarz-Weig, E.; Keil, A. & Epplen, J. T. (1999). "Behavioural Strategies, Testis Size, and Reproductive Success in Two Caviomorph Rodents With Different Mating Systems". Behaviour. 136 (9): 1203–1217. doi:10.1163/156853999501720. JSTOR4535670.
Sachser, N.; Schwarz-Weig, E.; Keil, A. & Epplen, J. T. (1999). "Behavioural Strategies, Testis Size, and Reproductive Success in Two Caviomorph Rodents With Different Mating Systems". Behaviour. 136 (9): 1203–1217. doi:10.1163/156853999501720. JSTOR4535670.