@misc{markert_variations_in_1990, 
author={Markert, B., Klausmeyer, N.},
title={Variations in the elemental composition of plants and computer aided sampling in ecosystems},
year={1990},
howpublished = {journal article},
note = {Markert, B.; Klausmeyer, N.: Variations in the elemental composition of plants and computer aided sampling in ecosystems. Toxicological and Environmental Chemistry. 1990. vol. 25, 201-212.}}