Nilssen, A. C., K. Åsbakk, R. E. Haugerud, W. Hemmingsen, and A. Oksanen. “Treatment of reindeer with ivermectin - effect on dung insect fauna”. Rangifer, vol. 19, no. 2, Apr. 1999, pp. 61-69, doi:10.7557/2.19.2.281.