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S. M. S. Islam and A. A. Kafi Majumdar, β€œOn the Diophantine equations z<sup>2</sup> = k(k<sup>2</sup> + 3) and z<sup>2</sup> = k(k<sup>2</sup> + 12)”, J Bangladesh Acad Sci, vol. 45, no. 1, pp. 127–129, Jul. 2021.