Huynh Pham Dung Phat, Pham Do Van Trung, and Le Nguyen Linh Trang. “ASSESSING THE APPLICATION OF CONTIGUOUS CARTOGRAM TO TEACHING SUBJECTS OF POPULATION”. UED Journal of Social Sciences, Humanities and Education, Vol. 4, no. 4, Dec. 2014, pp. 109-13, doi:10.47393/jshe.v4i4.362.