Affiliation: | 1. The National Museum of Denmark, Department of Conservation, P.O. Box 260, DK 2800, Lyngby, Denmark;2. Risø National Laboratory, Biosystems Department, P.O. Box 49, DK 4000, Roskilde, Denmark;3. Technical University of Denmark, Department of Chemical Engineering, Danish Polymer Centre, Building 423, DK 2800, Lyngby, Denmark |