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Nico Caspary, Elena V. Savchenko, Anton Thoma, Andreas Lammers, and Vladimir E. Bondybey, Optical spectra of CuO2 and matrix effect upon its structure: Low-Temperature Physics and Chemistry in Cryomatrice, Low Temp. Phys. 26, (2000) [Fiz. Nizk. Temp. 26, 1001-1010, (2000)] DOI: https://doi.org/10.1063/1.1312402.