Lukowski SL, DiTrapani J, Rockwood NJ, Jeon M, Thompson LA, Petrill SA. Etiological distinction across dimensions of math anxiety. Behav Genet. 2019 May;49(3):310-6. doi: 10.1007/s10519-018-09946-3
Hartman M, Bolton E, Fehnel SE. Accounting for age differences on the Wisconsin Card Sorting Test: decreased working memory, not inflexibility. Psychol Aging. 2001 Sep 1;16(3):385-99.