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Arsyad, Y. M.; Mega Nurhanisa; Elsa Narulita; Ayunda Dwi Handayani; Frinelda Rehulina Barus; Tri Rahma Febrianti Maharani; Hilyana Agis Risla; Latifah Tri Amanda; Delia Amanda; Zahraini Tasya Siregar. Dependence of Crystallinity and Crystallite Size of Hydroxyapatite from Chicken Eggshell on Calcination Time : A Comparative Study on Scherrer Approach. NMJ 2025, 6, 79-86.