Improving energy efficiency of biotechnical agricultural systems - scientific and organisational issues [Online resource]Karpov, V.; Kabanen, Toivo9th International Conference "Biosystems Engineering 2018": 9–11 May, 2018, Estonia, Tartu : book of abstracts2018 / p. 139 http://bse.emu.ee/wp-content/uploads/2018/10/ABS_2018_Book_VV.pdf