1. Laurenzi Tabasso M., Air Pollution and Maintenance of Buildings: an Unpleasant, Costly Correlation, Patrimonio Historico Artistico y Contaminaciòn, Consorcio para la Organización de Madrid capital Europea de la cultura, Madrid, 1992, pp. 101–105.
2. Brimblecombe P., Per una ricostruzione dei fenomeni di inquinamento atmosferico del passato, in Città Inquinata - I Monumenti, Ist. Poligrafico e Zecca dello Stato, Rome, 1989, pp. 25–32.
3. The decay of building stones through soot;Warnes;Sand Clays and Minerals,1934
4. Burdick L.R., Barkley J.F., Effect of sulphur compounds on various materials, in Circular 7064, U.S. Bureau of Mines Information, Washington DC, 1939.
5. Study of the stones of Brussels’ monuments: effects of air pollution;Camerman;Bull. Soc. Belge Géol. Paléont. Hydrol.,1945