LATE CHANGES IN A RECIPIENT''S TISSUES AFTER IMPLANTATION OF SYNTHETIC HYDROXYAPATITE OF VARYING DENSITY: AN EXPERIMENTAL MORPHOLOGICAL STUDY Article Dushin N.V., Ivanov V.Iu., Fedorov A.A., Shkliaruk V.V., Severin V.A. Vestnik Oftalmologii. ООО "Издательство Медиа Сфера". Vol. 121. 2005. P. 38-40