Source apportionment of fine (PM1.8) and ultrafine (PM0.1) airborne particulate matter during a severe winter pollution episode.
Kleeman MJ, Riddle SG, Robert MA, Jakober CA, Fine PM, Hays MD, Schauer JJ, Hannigan MP. Source apportionment of fine (PM1.8) and ultrafine (PM0.1) airborne particulate matter during a severe winter pollution episode. Environ Sci Technol. 2009 Jan 15; 43(2):272-9.