@Article{acpd-8-569-2008,
AUTHOR = {Xie, S. and Liu, Z. and Chen, T. and Hua, L.},
TITLE = {Spatiotemporal variations of ambient PM$_{10}$ source contributions in Beijing in 2004 using positive matrix factorization},
JOURNAL = {Atmospheric Chemistry and Physics Discussions},
VOLUME = {8},
YEAR = {2008},
NUMBER = {1},
PAGES = {569--599},
URL = {http://www.atmos-chem-phys-discuss.net/8/569/2008/},
DOI = {10.5194/acpd-8-569-2008}
}