Oster, H., van der Horst, G. T., & Albrecht, U. (2003). Daily Variation of Clock Output Gene Activation in Behaviorally Arrhythmic mPer/mCry Triple Mutant Mice. Chronobiology International, 20(4), 683-695. Retrieved from http://informahealthcare.com/doi/pdf/10.1081/CBI-120022408.