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\bibitem{Delalieux_etal2001} {\textquotedblleft}\textit{Environmental conditions controlling the chemical weathering of the Madara Horseman monument, NE Bulgaria}{\textquotedblright}. Delalieux F, Cardell C, Todorov V, Dekov V, Van Grieken R, Journal of cultural heritage \textbf{2}, 43 (2001)

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