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Die Naturwissenschaften|November 30, 2006
Where clocks are redundant: weak circadian mechanisms in reindeer living under polar photic conditionsBob E H van Oort, Nicholas J C Tyler, Menno P Gerkema, et al.The Journal of Experimental Biology|May 27, 2011
Arctic reindeer extend their visual range into the ultravioletChristopher Hogg, Magella Neveu, Karl-Arne Stokkan, et al.Proceedings. Biological Sciences|November 1, 2013
Shifting mirrors: adaptive changes in retinal reflections to winter darkness in Arctic reindeerKarl-Arne Stokkan, Lars Folkow, Juliet Dukes, et al.Hormones and Behavior|April 12, 2008
Ambient temperature effects on photo induced gonadal cycles and hormonal secretion patterns in Great Tits from three different breeding latitudesBengt Silverin, John Wingfield, Karl-Arne Stokkan, et al.Nature|December 24, 2005
Circadian organization in reindeerBob E H van Oort, Nicholas J C Tyler, Menno P Gerkema, et al.Journal of Biological Rhythms|September 17, 2016
Behavioral Timing without Clockwork: Photoperiod-Dependent Trade-Off between Predation Hazard and Energy Balance in an Arctic UngulateNicholas J C Tyler, Pablo Gregorini, Mads C Forchhammer, et al.Pageof 2