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APA Citation
Sunyer, J., Spix, C., Quénel, P., Ponce-de-León, A., Pönka, A., Barumandzadeh, T., Touloumi, G., Bacharova, L., Wojtyniak, B., Vonk, J., Bisanti, L., Schwartz, J., & Katsouyanni, K. (1997). urban air pollution and emergency admissions for asthma in four European cities: the APHEA Project.. Thorax, 52(9), 760–765. http://access.bl.uk/ark:/81055/vdc_100151248613.0x000041