Genesis of black crusts on building stones from three Italian cities: relations with environmental pollution

Barca D. (*), Belfiore C.M. (°), Crisci G.M. (*), La Russa M.F. (*), Pezzino A. (°) & Ruffolo S.A. (*)
(*) Department of Earth Sciences, University of Calabria, Via Ponte Pietro Bucci, 87036 Arcavacata di Rende (CS), Italy. (°) Department of Biological, Geological and Environmental Sciences, University of Catania, Corso Italia 57, 95129 Catania, Italy.