Sitnikova, Maria A., et al. “The Neural Correlates of Exact Calculation in Word and Numerical Formats in Low And High Math Performers: A FNIRS Study”. International Journal of Cognitive Research in Science, Engineering and Education (IJCRSEE), vol. 11, no. 1, Apr. 2023, pp. 93-114, doi:10.23947/2334-8496-2023-11-1-93-114.