@misc{nagel_selforganizing_criticality_1992, 
author={Nagel, K.,Raschke, E.},
title={Self-organizing criticality in cloud formation?},
year={1992},
howpublished = {GKSS report},
note = {Online available at: \url{} (DOI). Nagel, K.; Raschke, E.: Self-organizing criticality in cloud formation?. GKSS 92-E-30. 1992.}}