@misc{lemmen_biogeochemical_cycles_2009, 
author={Lemmen, C.},
title={Biogeochemical Cycles and EarthSystem Science: Part 4},
year={2009},
howpublished = {lecture: Universitaet Kiel, FB Mathematisch-naturwissenschaftliche Fakultaet; 11.05.2009},
note = {Online available at: \url{} (DOI). Lemmen, C.: Biogeochemical Cycles and EarthSystem Science: Part 4. Universitaet Kiel, FB Mathematisch-naturwissenschaftliche Fakultaet, 2009.}}