1. ICCROM Int. Symp. on Mortars, Cement and Grouts used in the Conservation of Historic Buildings, Rome, November 1981.
2. Alessandrini G.—Gli intonaci nell’ edilizia storica: metodologie analitiche per la caratterizzazione chimica e fisica, Convegno di Studi-L’intonaco: storia, cultura e tecnologia, Bressanone, June 1985, Libreria Progretto Editore Padova, pp. 147–166.
3. Torraca G.—Porous building materials, ICCROM, Rome, 1982.
4. BRE Digest 177.—Decay and conservation of stone masonry, England, 1984.
5. Rossi-Doria P., Tabasso M., Torraca G.—Note on conservation treatment of stone objects, Proceedings of the Int. Symp. UNESCO/RILEM. Deterioration and protection of stone monuments, Paris 1978, No. 6.12.