Bulgakov, V., I. Golovach, and V. Adamchuk. “Theoretical Research of the Impact of the Digging-Out Working Tool on the Beetroot During the Vibrational Digging up from the Soil”. Agricultural Science and Practice, Vol. 2, no. 2, July 2015, pp. 9-20, doi:10.15407/agrisp2.02.009.