Colman, J. E.; Eidesen, R.; Hjermann, D.; Gaup, M. A.; Holand, Ø.; Moe, S. R.; Reimers, E. Reindeer 24-Hr Within and Between Group Synchronicity in Summer versus Environmental Variables. Ran 2004, 24 (1), 25-30. https://doi.org/10.7557/2.24.1.298.