1. D.A. Scott, J. Am. Inst. Conserv. 29, 193 (1990)
2. I.D. MacLeod, ICCM Bulletin, ICC M Inc., Canberra, VII (1981) p. 16
3. E. Mattsson, A.G. Nord, K. Tronner, M. Fjaestad, A. Lagerlof, I. Ullen, G.C. Borg, Konserverings-Tekniska studier, ed. by Gunnel Friberg (Stockholm 1996) p. 5.
4. D.A. Scott, J. Am. Inst. Conserv. 33, 1 (1994)
5. JCPDS Powder Diffraction File, Int. Centre for Diffraction Data, Swarthmore