Werf, Inez D. van der, Klaas Jan van den Berg, Sibylle Schmitt, and Jaap J. Boon. "Molecular Characterization of Copaiba Balsam as Used in Painting Techniques and Restoration Procedures." Studies in Conservation 45/1 (2000).

Werf, Inez D. van der, Klaas Jan van den Berg, Sibylle Schmitt, and Jaap J. Boon. "Molecular Characterization of Copaiba Balsam as Used in Painting Techniques and Restoration Procedures." Studies in Conservation 45/1 (2000).