@Article{acp-8-655-2008,
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 = {Variation and balance of positive air ion concentrations in a boreal forest},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {8},
YEAR = {2008},
NUMBER = {3},
PAGES = {655--675},
URL = {http://www.atmos-chem-phys.net/8/655/2008/},
DOI = {10.5194/acp-8-655-2008}
}