N. Kania, Y. S. Kusumah, J. A. Dahlan, E. Nurlaelah, F. Gí¼rbí¼z, and E. Bonyah, “Constructing and providing content validity evidence through the Aiken’s V index based on the experts’ judgments of the instrument to measure mathematical problem-solving skills”, REiD, vol. 10, no. 1, pp. 64–79, Jun. 2024.