Le Diem Bui, L.; Gi Kim, Y.; Won Ho, W.; Tthi Thu Ho, H.; Tinh Tran, T.; Phuong Hoang, Y.; Le Diem Trang, B. The Building OER in Okmindmap for Innovative Teaching and Learning. IJET 2018, 7 (4.9), 26-31. https://doi.org/10.14419/ijet.v7i4.9.20610.