Thiel, M.-J., ed. Conservation of stone and other materials: proceedings of the International RILEM/UNESCO Congress "Conservation of Stone and Other Materials--Research-Industry-Media." Paris, June 29-July 1, 1993. London; New York: E & FN Spon, 1993.

Thiel, M.-J., ed. Conservation of stone and other materials: proceedings of the International RILEM/UNESCO Congress "Conservation of Stone and Other Materials--Research-Industry-Media." Paris, June 29-July 1, 1993. London; New York: E & FN Spon, 1993.