ГРЕЧКА, Г. М. Economic value of Ukrainian steppe bees. Scientific Progress & Innovations, [S. l.], n. 2, p. 67–69, 2013. DOI: 10.31210/visnyk2013.02.17. Disponível em: https://journals.pdau.edu.ua/visnyk/article/view/489. Acesso em: 24 aug. 2025.