@misc{schroeder_redesign_of_1989, 
author={Schroeder, F. P.,Koch, W.,Kaeselau, K. H.},
title={Redesign of an approved condensation nucleus counter for stationary use},
year={1989},
howpublished = {journal article},
note = {Online available at: \url{} (DOI). Schroeder, F.; Koch, W.; Kaeselau, K.: Redesign of an approved condensation nucleus counter for stationary use. Journal of Aerosol Science. 1989. vol. 20, 1521-1524.}}