Colman, Jonathan E., Ruben Eidesen, Dag Hjermann, Mathis A. Gaup, Øystein Holand, Stein R. Moe, and Eigil Reimers. 2004. “Reindeer 24-hr within and between group synchronicity in summer versus environmental variables”. Rangifer 24 (1):25-30. https://doi.org/10.7557/2.24.1.298.