Authors
Jüri Olt
Estonian University of Life Sciences, Institute of Technology, Tartu, Estonia
Viacheslav V. Maksarov
Saint-Petersburg Mining University, Department of Mechanical Engineering, St. Petersburg
Kaarel Soots
Estonian University of Life Sciences, Institute of Technology, Tartu, Estonia
Tõnu Leemet
Estonian University of Life Sciences, Institute of Technology, Tartu, Estonia