[1]
Purnama, P.W. and Retnowati, E. 2020. The effectiveness of goal-free problems for studying triangle similarity in collaborative groups. JRAMathEdu (Journal of Research and Advances in Mathematics Education). 6, 1 (Dec. 2020), 32–45. DOI:https://doi.org/10.23917/jramathedu.v6i1.11198.