Lee, S. C., Cheng, Y., Ho, K., Cao, J., Louie, P., Chow, J. C., Watson, J. G. (2006). PM1.0 and PM2.5 characteristics in the roadside environment of Hong Kong, Aerosol Sci.Technol., 157-165, 40: 3, 10.1080/02786820500494544