@misc{markert_multielement_analysis_1991, 
author={Markert, B.},
title={Multi-element analysis in plant material},
year={1991},
howpublished = {book part},
note = {Online available at: \url{} (DOI). Markert, B.: Multi-element analysis in plant material. In: Esser, G.; Overdieck, D. (Ed.): Facets of modern ecology. Amsterdam: Elsevier. 1991. 275-293.}}