Copenhagen--a significant source of birch (Betula) pollen?
Skjøth CA, Sommer J, Brandt J, Hvidberg M, Geels C, Hansen KM, Hertel O, Frohn LM, Christensen JH.
Skjøth CA, et al. Among authors: brandt j.
Int J Biometeorol. 2008 Jul;52(6):453-62. doi: 10.1007/s00484-007-0139-y. Epub 2007 Dec 20.
Int J Biometeorol. 2008.
PMID: 18095007