1. Ultrafine particles in four European urban environments: Results from a new continuous long-term monitoring network. (July 2016) Authors: Hofman, J.; Staelens, J.; Cordell, R.; Stroobants, C.; Zikova, N.; Hama, S.M.L.; Wyche, K.P.; Kos, G.P.A.; Van Der Zee, S.; Smallbone, K.L.; Weijers, E.P.; Monks, P.S.; Roekens, E. Journal: Atmospheric environment Issue: Volume 136(2016) Page Start: 68 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗