Tran Trung, Nguyen Thi Thanh Tam, and Dang Thanh Hung. 2012. “USING THE SOFTWARE GEOGEBRA AS A MEANS OF VISUAL LEARNING IN TEACHING HOW TO SOLVE TRANSFORMATION PROBLEMS”. UED Journal of Social Sciences, Humanities and Education 2 (1), 39-45. https://doi.org/10.47393/jshe.v2i1.368.