Garrity, S. R., Bohrer, G., Maurer, K. D., Mueller, K. L., Vogel, C. S., Curtis, P. S. (2011/12) A Comparison Of Multiple Phenology Data Sources For Estimating Seasonal Transitions In Deciduous Forest Carbon Exchange,
Agricultural And Forest Meteorology, 151(12), 1741-1752. https://doi.org/10.1016/j.agrformet.2011.07.008