A. A. Mohd Abdul Aziz, M. Puteh, and M. Adnan, “Development and Validating the Number and Mathematical Operations Problem-Solving Framework in the Form of Higher Order Thinking Skill (HOTS) through Bar Model Strategy - A Fuzzy Delphi Methods”, J. Sci. Math. Lett., vol. 11, pp. 1–8, Nov. 2023, doi: 10.37134/jsml.vol11.sp.1.2023.