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[3] D. Aladzhov, Bulletin of the Museums from South-East Bulgaria 20, 17 (1994) (in Bulgarian)
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[9] A. Detcheva, R. Georgieva, E. Ivanova, Compt. Rend. Acad. Bulg. Sci. 63, 1123 (2010)
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[10] R. Kirov, E. Kashchieva, Y. Dimitriev, S. Tsaneva, J. Univ. Chem. Technol. Metallurgy 38, 1449 (2003)