INFLUENCE OF THERMOLYSIS IN THE NITROGEN MEDIUM ON PHYSICOCHEMICAL PROPERTIES OF MEDICAL USING MATERIAL BASED ON BIOGENIC HYDROXYAPATITE. - Otychenko, O. M.; Babutina, T. E.; Parkhomey, O. R.; Budylina, O. M.; Protsenko, L. S.; Uvarova, I. V. (Chemistry, Physics & Technology of Surface / Khimiya, Fizyka ta Tekhnologiya Poverhni, 2017)