Cornu, Véronique, Caroline Hornung, Christine Schiltz, and Romain Martin. “How Do Different Aspects of Spatial Skills Relate to Early Arithmetic and Number Line Estimation?”. Journal of Numerical Cognition 3, no. 2 (December 22, 2017): 309-343. Accessed September 26, 2022. https://jnc.psychopen.eu/index.php/jnc/article/view/5739.