1. Monitoring of pollution;Barratt,1976
2. Airborne lead levels throughout Birmingham;Barratt;Int. Environ. Saf.,1980
3. Criteria (Dose/Effect Relationships) for Cadmium;Commission of the European Communities,1978
4. Directive on a limit value for lead in the air;EEC;Directive 82/884/EEC. OJ > No. L378, 31.12.1982,1982
5. Estimation of contribution of jet aircraft operations to trace element concentration at or near airports;Fordyce;J. Air Pollut. Control Assoc.,1975