عبدالكبير سأع. CONSTRUCTING FORMAL MATHEMATICAL PROBLEMS WITH A NTH FORM USING INDUCTION (HOW MANY TRIANGLES IN TRIANGLE?) . Electron. J. Univ. Aden Hum. Social Sci. [Internet]. 2023Mar.31 [cited 2025Apr.3];4(1):149-83. Available from: https://ejua.net/index.php/EJUA-HS/article/view/241