Vogel, Stephan E., Trent Haigh, Gerrit Sommerauer, Melanie Spindler, Clemens Brunner, Ian M. Lyons, and Roland H. Grabner. “Processing the Order of Symbolic Numbers: A Reliable and Unique Predictor of Arithmetic Fluency”. Journal of Numerical Cognition 3, no. 2 (December 22, 2017): 288-308. Accessed April 18, 2024. https://jnc.psychopen.eu/index.php/jnc/article/view/5737.