@misc{richnow_formation_of_1999, 
author={Richnow, H.H.,Eschenbach, A.,Mahro, R.,Kaestner, K.,Annweiler, F.,Seifert, R.,Michaelis, W.},
title={Formation of Nonextractable Soil Residues: A Stable Isotope Approach},
year={1999},
howpublished = {journal article},
note = {Online available at: \url{} (DOI). Richnow, H.; Eschenbach, A.; Mahro, R.; Kaestner, K.; Annweiler, F.; Seifert, R.; Michaelis, W.: Formation of Nonextractable Soil Residues: A Stable Isotope Approach. Environmental Science and Technology. 1999. vol. 33, no. 21, 3761-3767.}}