@article{HelsperNiessner2006,
  author    = {Christoph Helsper and R. Nießner},
  title     = {On the Influence of the Vapour Substance on the Behaviour of an Expansion Type Condensation Nucleus Counter},
  journal   = {Journal of Aerosol Science. 16 (1985), H. 5},
  pages     = {457 -- 461},
  year      = {2006},
}