Ashmore MR, Wilson [E]RB.
Critical levels of air pollutants for Europe. London: Air Quality Division, Department of the Environment; 1994.
Fuhrer J.
Critical levels for ozone; a UNECE workshop report. (
Achermann B). Liebefeld-Bern: Swiss Federal Research Station for Agricultural Chemistry and Environmental Hygiene; 1994.
Solomon S, Qin D, Manning M, Chen Z, Marquis KB, Averyt M, Tignor M, Miller HL.
Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, 2007. Cambridge, United Kingdom and New York, NY, USA.: Cambridge University Press; 2007.