Опара, В. М., and О. А. Домбровська. “Social and Economic Value of Rental Agreements in the Agricultural Land Use in Ukraine”. Visnyk of V. N. Karazin Kharkiv National University, Series "Geology. Geography. Ecology", Vol. 39, no. 1084, Dec. 2013, pp. 155-9, https://periodicals.karazin.ua/geoeco/article/view/7576.