cpas-egypt.comcpas-egypt.com/pdf/Hanan/PHD/002.pdfl- Dr Jose. M. Casal, Lighting Journal,...
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cpas-egypt.comcpas-egypt.com/pdf/Hanan/PHD/002.pdfl- Dr Jose. M. Casal, Lighting Journal, Illumination and Conservation Of Paintings, December 1989, Volume 54, p. 236