Helland-Riise F, Martinussen M. The Psychometric Properties of the Norwegian version of Ravens Matrices (Standard Progressive Matrices (SPM)/Coloured Progressive Matrices (CPM)). PTB [Internet]. 2017 Dec. 18 [cited 2025 Apr. 18];7(2):1-20. Available from: https://new.eludamos.org/index.php/psyktestbarn/article/view/7472