Demirel AH, Simsekler Dizman T. Pre-Service Mathematics Teachers’ Understanding of Quadrilateral Definitions and Hierarchical Relationships: A Van Hiele Perspective. IJPES [Internet]. 2025 Oct. 28 [cited 2026 Feb. 3];12(4):255-70. Available from: https://ijpes.com/index.php/ijpes/article/view/1484