1. Microanalysis of hydroxyquinones in red lakes;Masschelein-Kleiner;Microchimica Acta,1967
2. Analyse des laques rouges anciennes;Masschelein-Kleiner;Stud. Conserv.,1968
3. The analysis of natural dyestuffs and organic pigments: comparative study into the possibilities and limits of various methods;Roelofs;ICOM preprint committee for conservation,1987
4. Identification of organic pigments in paint, Journal of Coatings;Kumar;Technology,1985
5. Cimatura de grana;Wallert;Identification Nat. Org. Colorants Binding Media Mediaeval Manuscript Illumination Z. Kunsttechnologie Konservierung,1991