Wege, Theresa Elise, Sophie Batchelor, Matthew Inglis, Honali Mistry, and Dirk Schlimm. “Iconicity in Mathematical Notation: Commutativity and Symmetry”. Journal of Numerical Cognition 6, no. 3 (December 3, 2020): 378-392. Accessed April 20, 2024. https://jnc.psychopen.eu/index.php/jnc/article/view/5923.