Schmale J., Henning S., Bas Henzing J.S., Keskinen H., Sellegri K., Ovadnevaite J., Bougiatioti A., Kalivitis N., Jefferson A., Park M., Schlag P., Kristensson A, Yoshioka M., Reddington C., Pringle K., Aalto P., Aijala M., Baltensperger U., Birmili W., Bukowiecki N., Fj?raa A.M., Fiebig M., Frank G., Frohlich R., Frumau A., Hammer E., Heikkinen L., Herrmann E., Holzinger R., Kanakidou M., Kiendler-Scharr A., Kos G., Kulmala M., Mihalopoulos N., Motos G., Nenes A., O’Dowd C., Paramonov M., Petaja T., Picard D., Poulain L., Sonntag A., Swietlicki E., Svenningsson B., Wiedensohler A., Wittbom C., Ogren J., Yum S., Lund Myhre C., Carslaw K., Stratmann F., and Gysel M. : Multi-year, multi-site dataset of collocated cloud condensation nuclei, aerosol size distribution and chemical composition observations, , Scientific Data Vol 4 Doi: 10.1038/sdata.2017.3