Vaganova, O. I., Sirotyk, S. D., Popkova, A. A., Smirnova, Z. V. and Bulaeva, M. N. (2019) “Additional education in higher professional educational institution”, Amazonia Investiga, 8(22), pp. 305–310. Available at: https://amazoniainvestiga.info/index.php/amazonia/article/view/448 (Accessed: 3 July 2024).