@misc{jayasekera_multilaboratory_characterization_1989, 
author={Jayasekera, R., Markert, B.},
title={Multi-laboratory characterization of ecological samples},
year={1989},
howpublished = {journal article},
note = {Jayasekera, R.; Markert, B.: Multi-laboratory characterization of ecological samples. Fresenius Journal of Analytical Chemistry. 1989. vol. 334, 226-230.}}