Bočková, Veronika, Gabriela Pavlovičová, and Ľubomír Rybanský. “Identification of Problematic Items and Analysis of Distractors of the Van Hiele Geometry Test”. International Journal of Instruction 19, no. 1 (January 1, 2026): 401–418. Accessed January 8, 2026. https://e-iji.net/ats/index.php/pub/article/view/865.