KOLTUNOV В., and VOVK М. “rade stimation of umpkin ortszoned in olisskiy egion of kraine”. "INTERNATIONAL·SCIENTIFIC-·PRACTICAL·JOURNAL·COMMODITIES·AND·MARKETS", vol. 8, no. 2, Feb. 2010, pp. 101-8, https://journals.knute.edu.ua/commodities-and-markets/article/view/1671.