L. Frati, S. Santoni, V. Nicolardi, C. Gaggi, G. Brunialti, A. Guttova, S. Gaudino, A. Pati, S.A. Pirintsos, S. Loppi,
Lichen biomonitoring of ammonia emission and nitrogen deposition around a pig stockfarm. Environmental Pollution. ,vol. 146, pp. 311- 316 ,(2007) ,
10.1016/J.ENVPOL.2006.03.029