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2. Kunt N., The Restoration of Paintings, Konemann, 1999, ISBN 3-89508-922-2.
3. Stulik D., Miller D., Khanjian H., Khandekar N., Wolbers R., Carlson J., Petersen W.C., Solvent Gels for the Cleaning of Works of Art - The Residue Question, Getty Publications, 2004, ISBN 0-89236-759-8.
4. Wolbers R., Cleaning Painted Surfaces, Archetype Publication, 2000, ISBN 1-873132-36-0.