@Article{acpd-7-9465-2007,
AUTHOR = {H\~orrak, U. and Aalto, P. P. and Salm, J. and Komsaare, K. and Tammet, H. and M\"akel\"a, J. M. and Laakso, L. and Kulmala, M.},
TITLE = {Characterization of positive air ions in boreal forest air at the  Hyytiälä SMEAR station},
JOURNAL = {Atmospheric Chemistry and Physics Discussions},
VOLUME = {7},
YEAR = {2007},
NUMBER = {4},
PAGES = {9465--9517},
URL = {http://www.atmos-chem-phys-discuss.net/7/9465/2007/},
DOI = {10.5194/acpd-7-9465-2007}
}