J J de Hartog, J G Ayres, A Karakatsani, A Analitis, H t. Brink, K Hameri, R Harrison, K Katsouyanni, A Kotronarou, I Kavouras, Cg Meddings, J.ij Pekkanen, G Hoek: Lung function and indicators of exposure to indoor and outdoor particulate matter among asthma and COPD patients, Occupational and Environmental Medicine Vol 67(1) p.2 – 10 Doi: 10.1136/ oem.2008. 040857, 2010