@Article{acp-12-7881-2012,
AUTHOR = {Liu, H. Z. and Feng, J. W. and J\"arvi, L. and Vesala, T.},
TITLE = {Four-year (2006–2009) eddy covariance measurements of CO$_{2}$ flux over an urban area in Beijing},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {12},
YEAR = {2012},
NUMBER = {17},
PAGES = {7881--7892},
URL = {http://www.atmos-chem-phys.net/12/7881/2012/},
DOI = {10.5194/acp-12-7881-2012}
}