Evaluating Biosphere Model Estimates of the Start of the Vegetation Active Season in Boreal Forests by Satellite Observations. - Kristin Böttcher; Tiina Markkanen; Tea Thum; Tuula Aalto; Mika Aurela; Christian H. Reick; Pasi Kolari; Ali Nadir Arslan; Jouni Pulliainen (Remote. Sens., 2016)