K. Yotovska and P.-G. Kalou, “Design of a University Course for the Training of Biology Teachers in a Virtual Environment (Analysis of Results Taking into Account Students’ Attitudes to the E-learning)”, ASRJETS-Journal, vol. 46, no. 1, pp. 58–70, Aug. 2018, Accessed: Sep. 21, 2025. [Online]. Available: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/4320