1. Conservation of historic stone buildings and monuments;Hawkins,1982
2. ACS Symposium;Rånby,1983
3. Charola AE, Laurenzi Tabasso M, Santamaria U. Determination and Conservation of Stone. In: Preprint of the Vth International Congress. Lausanne, 1985. p. 739.
4. Matteoli U, Aglietto M, Fassina V, Botteghi C, Passaglia E, Ciardelli F. Methods of Evaluating Products for the Conservation of Porous Building Materials in Monuments. In: Proceedings of the International Colloquium. Rome, 1995. p. 373.
5. Tiano P, Manganelli Del Fa C, Fratini F, Pecchioni E, Lucido V, Piacenti F. Determination and Conservation of Stone. In: Proceedings of the VIth International Congress. Torun, 1988. p. 492.