Reindl, N.J., et al. “Female Fecundity, Neonatal Mortality and the Impact of Contagious Ecthyma on a Captive Herd of Muskoxen”. Rangifer, vol. 13, no. 3, Dec. 1993, pp. 179-80, https://doi.org/10.7557/2.13.3.1111.