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2. A comparison of the corrosive action on Pentelic marble of nitrates and sulphates with the action of nitrogen oxides and sulphur dioxide;Delopoulou;Atmospheric Environment,1992
3. Formation of ozone in Los Angeles smog;Haagen-Smith,1952
4. Haneef J. S. (1993) Personal communication.
5. Nitric acid and particulate nitrates, sulphates and ammonium in the atmosphere of Athens, Greece;Kirkitsos;Ekistics,1991