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\bibitem{Gysels_etal2004} {\textquotedblleft}\textit{Indoor environment and conservation in the Royal Museum of Fine Arts, Antwerp, Belgium}{\textquotedblright}. Gysels K, Delalieux F, Deutsch F, Van Grieken R, Camuffo D, Bernardi A, Sturaro G, Busse H-J, Wieser M, Journal of cultural heritage \textbf{5}, 221 (2004).   http://doi.org/10.1016/S1296-2074(04)00033-0

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