Nanu, Cristina, Eero Laakkonen, and Minna Hannula-Sormunen. “The Effect of First School Years on Mathematical Skill Profiles”. Frontline Learning Research 8, no. 1 (February 25, 2020): 56–75. Accessed May 6, 2024. https://journals.sfu.ca/flr/index.php/journal/article/view/485.