Осадчук, О. О., and Р. Ю. Гаврилянчик. “BUCKWHEAT LEAF-AREA DURATION IN TERMS OF SPRING AND SUMMER SOWING IN WESTERN FOREST STEPPE”. Podilian Bulletin: Agriculture, Engineering, Economics, no. 27, Dec. 2017, pp. 45-51, http://pb.pdatu.edu.ua/article/view/134084.