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2. Hegarty, M., Kozhevnikov, M.: Types of visual-spatial representations and mathematical problem solving. J. Educ. Psychol. 91(4), 684–689 (1999)
3. Texas School for the Blind and Visually Impaired, “Math Melodies,” (2014). https://www.tsbvi.edu/tx-senseabilities/issues/spring-summer-2014-issue/math-melodies
4. Perkins School for the Blind, “Math Melodies App: Young Students,” https://www.perkins.org/resource/math-melodies-app-young-students/
5. Apple Vis, “Math Melodies | AppleVis,” (2017). https://www.applevis.com/apps/ios/education/math-melodies