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Synthesis, structural features, and color of calcium-yttrium hydroxyapatite with copper ions in hexagonal channels

M. Jansen, M. Pogosova, Y. Tretyakov, 2013, Russian Journal of Inorganic Chemistry.

New Aspects on Fluorination of Bi(Pb)-Sr-Ca-Cu-O - Reasons for the Improved Superconducting Properties.

E. Kemnitz, R. Kremer, V. Pershin, 1993 .