The influence of chemical composition and mixing state of Los Angeles urban aerosol on CCN number and cloud properties. - Cubison, M. J.; Ervens, B.; Feingold, G.; Docherty, K. S.; Ulbrich, I. M.; Shields, L.; Prather, K.; Hering, S.; Jimenez, J. L. (Atmospheric Chemistry & Physics, 2008)