Göbel, Silke M., Karin Landerl, and Arne O. Lervåg. “Longitudinal Predictors of Conceptual Understanding of Arithmetic Principles”. Journal of Numerical Cognition 12 (March 19, 2026): Article e19523. Accessed May 2, 2026. https://jnc.psychopen.eu/index.php/jnc/article/view/19523.