Toomsalu, L. M., T. V. Yarovova, M. V. Vinogradova, and N. I. Nikitina. “Studying the Effectiveness of Teacher Training in Organization of Open Education”. Amazonia Investiga, vol. 8, no. 24, Nov. 2019, pp. 306-14, https://amazoniainvestiga.info/index.php/amazonia/article/view/988.