D. H. Qendraj, E. Xhafaj, A. Xhafaj, and E. Halidini "Ranking the Most Important Attributes of using Google Classroom in online teaching for Albanian Universities: A Fuzzy AHP Method with Triangular Fuzzy Numbers and Trapezoidal Fuzzy Numbers", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 297–308, 2021, doi: 10.25046/aj060134.