Bayu Putra R, Defit S, Fitri H. EVALUATION OF THE QUALITY OF ONLINE LEARNING USING THE ROUGH SET METHOD IN THE COVID 19 ERA . jit [Internet]. 2021 Jun. 7 [cited 2024 Nov. 28];15(2):159-70. Available from: http://291726.ochkinterhk.tech/index.php/jit/article/view/256