عبدالكبير س. أ. ع. (2023). CONSTRUCTING FORMAL MATHEMATICAL PROBLEMS WITH A NTH FORM USING INDUCTION (HOW MANY TRIANGLES IN TRIANGLE?) . Electronic Journal of University of Aden for Humanity and Social Sciences, 4(1), 149–183. https://doi.org/10.47372/ejua-hs.2023.1.241