TY - JOUR A1 - Hirsikko, A. A1 - Bergman, T. A1 - Laakso, L. A1 - Dal Maso, M. A1 - Riipinen, I. A1 - Hõrrak, U. A1 - Kulmala, M. T1 - Identification and classification of the formation of intermediate ions measured in boreal forest JO - Atmos. Chem. Phys. J1 - ACP VL - 7 IS - 1 SP - 201 EP - 210 Y1 - 2007/01/15 PB - Copernicus Publications SN - 1680-7324 UR - http://www.atmos-chem-phys.net/7/201/2007/ L1 - http://www.atmos-chem-phys.net/7/201/2007/acp-7-201-2007.pdf DO - 10.5194/acp-7-201-2007 ER -