MoeS. R., Holand Øystein, ColmanJ. E., and ReimersE. “Reindeer (Rangifer Tarandus) Response to Feces and Urine from Sheep (Ovis Aries) and Reindeer”. Rangifer, Vol. 19, no. 2, Apr. 1999, pp. 55-60, doi:10.7557/2.19.2.280.