РЯБА, О. І. History and evolution of improved grain farming systems. Scientific Progress & Innovations, [S. l.], n. 3, p. 44–48, 2012. DOI: 10.31210/visnyk2012.03.08. Disponível em: https://journals.pdau.edu.ua/visnyk/article/view/631. Acesso em: 4 sep. 2025.