SHPAK, A. P.; KARBOVSKII, V. L.; VAKHNEY, A. G.; KLUYENKO, L. P. Spectral and quantum-mechanical study of electronic structure of ultradispersed calcium hydroxyapatite. Поверхня, [S. l.], n. 7-8, p. 57–68, 2002. Disponível em: http://www.surfacezbir.com.ua/index.php/surface/article/view/83. Acesso em: 24 вер. 2026.