1. Ausset, P., R. A. Lefèvre, and M. Del Monte. 2000. Early mechanisms of development of sulfated black crusts on carbonate stone, p. 329-337. In V. Fassina (ed.), Proceedings of the 9th International Congress on Deterioration and Conservation of Stone, Venice, Italy. Elsevier Science, Amsterdam, The Netherlands.
2. Bugini, R., M. Laurenzi Tabasso, and M. Realini. 2000. Rate of formation of black crusts on marble. A case study. J. Cultural Heritage1:111-116.
3. Campanella, C. 1990. La conservazione della “pelle” lapidea: dalle tecniche tradizionali all'impiego del Laser. Recuperare50:610-613.
4. Gauri, L. K., A. N. Chowdhury, N. P. Kulshreshtha, and A. R. Punuru. 1989. The sulfation of marble and the treatment of gypsum crusts. Stud. Conserv.34:201-206.
5. Gauri, L. K., L. Parks, J. Jaynes, and R. Atlas. 1992. Removal of sulphated-crust from marble using sulphate-reducing bacteria, p. 160-165. In G. M. Robin (ed.), Stone cleaning and the nature, soiling and decay mechanisms of stone. Proceedings of the International Conference, 14 to 16 April 1992. Donhead Publishing Ltd., Webster, Edinburgh, United Kingdom.