1. Obiols, J. and Serena, J. M. 1984. “Data on the composition of Heavy Metals and Anions in the suspended particles in Urban Air”. 3rd International Congress of Analytical Techniques in Environmental Chemistry. 1984, Barcelona. Paper being printed by “AFINIDAD”
2. Lippman, M. and Schelesinger, R. B. 1979. “Chemical contamination in the human environment”. Oxford University Press. Ch. 6.
3. Henderson‐Sellers, B. 1984.Pollution of our Atmosphere, 99Bristol: Adam Hilger Ltd.
4. Chemical associations of lead, cadmium, copper, and zinc in street dusts and roadside soils