1.
Siagian PPG, Sinaga B, Mulyono M. Analysis of Difficulty of Student’s Geometry Problem Solving Based on Van Hiele’s Thinking Theory with Macromedia Flash. Int. J. Emerg. Math. Educ. [Internet]. 2020 Apr. 20 [cited 2024 Nov. 23];3(2):162-76. Available from: https://journal.uad.ac.id/index.php/IJEME/article/view/13658