Оліфірович, В. О. “THE GROWTH, DEVELOPMENT AND FEATURES OF BOTANICAL HERBAGE FORMATION OF BIRDS’ FOOT TREFOIL WITH TIMOTHY DEPENDING ON FERTILIZER”. Podilian Bulletin: Agriculture, Engineering, Economics, vol. 1, no. 24, Mar. 2016, pp. 172-9, http://pb.pdatu.edu.ua/article/view/135501.