@article{HelsperNiessner2006,
  author    = {Christoph Helsper and R. Nießner},
  title     = {Application of a Multistep Condensation Nuclei Counter as a Detector for Particle Surface Composition / Nießner, R. ; Helsper, C.},
  journal   = {Journal of Aerosol Science. 16 (1985), H. 3},
  pages     = {201 -- 209},
  year      = {2006},
}