Authors
Mait Lang
Tartu Observatory, University of Tartu, Tõravere, Estonia
Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Tartu, Estonia
Maris Hordo
Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Tartu, Estonia
Sandra Metslaid
Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Tartu, Estonia
Piia Post
Institute of Physics, University of Tartu, Tartu, Estonia
Toomas Tamm
Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Tartu, Estonia