“Nitrogen Sorption Isotherms of Biologically Synthesized Non-Stoichiometric Hydroxyapatite Nanoparticles (HAp NPs) Extracted from Fish Bones”. Global Journal of Science Frontier Research 21, no. C2 (May 8, 2021): 25–37. Accessed August 13, 2026. https://www.journalofscience.org/index.php/GJSFR/article/view/2941.