Authors
Mihkel Kaha
Tartu Observatory, University of Tartu, Tõravere, Estonia
Mait Lang
Tartu Observatory, University of Tartu, Tõravere, Estonia
Institute of Forestry and Engineering, Estonian University of Life Sciences, Tartu, Estonia
Shaohui Zhang
School of Forest Sciences, University of Eastern Finland, Joensuu, Finland
Jan Pisek
Tartu Observatory, University of Tartu, Tõravere, Estonia