Bartoszewicz, Małgorzata, Hanna Gulińska, and Mariia Gaidova. 2020. “The Use of E-Learning Platform by Flipped Classroom Method in Chemistry Lessons in Poland and Ukraine – Case Study”. International Journal of Research in E-Learning 6 (1):1-12. https://doi.org/10.31261/IJREL.2020.6.1.10.