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Ballester, E., Roca, J., Rodriguez-Roisin, R., & Agusti-Vidal, A. (1986). effect of nifedipine on arterial hypoxaemia occurring after methacholine challenge in asthma.. Thorax, 41(6), 468–472. http://access.bl.uk/ark:/81055/vdc_100135558668.0x000028