Warmest extreme year in U.S. history alters thermal requirements for tree phenology

Carter, J.M., M.E. Orive, L.M. Gerhart, J.H. Stern, R.M. Marchin, J. Nagel, and J.K. Ward. 2015. Warmest extreme year in U.S. history alters thermal requirements for tree phenology. Proceedings of the National Academy of Science U.S.