Sano, Mina. “Exploring Effective Feature Quantities for Machine Learning to Predict Developmental Degree of Musical Expression in Early Childhood: A Recent Study”. Current Research in Language, Literature and Education Vol. 7 (July 1, 2022): 82–109. Accessed June 4, 2026. https://stm.bookpi.org/CRLLE-V7/article/view/7540.