1. R. Larsen, in: STEP Leather Project, European Commission DG XII, Research Report No. 1, The Royal Danish Academy of Fine Arts, School of Conservation, Copenhagen, 1994, p. 165.
2. R. Larsen, Fundamental aspects of the deterioration of vegetable tanned leathers, Ph.D. Thesis, The Royal Danish Academy of Fine Arts, School of Conservation, Copenhagen, 1995, p. 35.
3. M. Odlyha, G.M. Foster, N.S. Cohen, R. Larsen, in: ICOM Committee for Conservation, 12th Triennial Meeting (Preprints), Lyon, 1999, p. 702.
4. R. Larsen, M. Vest, C. Calnan, in: STEP Leather Project, European Commission DG XII, Research Report No. 1, The Royal Danish Academy of Fine Arts, School of Conservation, Copenhagen, 1994, p. 11.