[1]
Siregar, H.M. et al. 2026. Representational Difficulty Across Cognitive Stages in Quadratic Functions: An APOS–Newman Analysis. International Journal of Cognitive Research in Science, Engineering and Education (IJCRSEE). 14, 2 (Aug. 2026), 317–329. DOI:https://doi.org/10.23947/2334-8496-2026-14-2-317-329.