@article{HelsperFissanThielen2006,
  author    = {Christoph Helsper and H. J. Fißan and H. J. Thielen},
  title     = {Determination of Particle Size Distributions by Means of an Electrostatic Classifier / Fißan, H. J.; Helsper, C. ; Thielen, H. J.},
  journal   = {Journal of Aerosol Science. 14 (1983), H. 3},
  pages     = {354 -- 357},
  year      = {2006},
}