@misc{knoechel_imaging_xray_1989, 
author={Knoechel, A.,Bavdac, M.,Ketelsen, P.,Petersen, W.},
title={Imaging X-ray fluoreszence analysis with synchrotron radiation: The SYXFA-microprobe},
year={1989},
howpublished = {journal article},
note = {Online available at: \url{} (DOI). Knoechel, A.; Bavdac, M.; Ketelsen, P.; Petersen, W.: Imaging X-ray fluoreszence analysis with synchrotron radiation: The SYXFA-microprobe. Fresenius Journal of Analytical Chemistry. 1989. vol. 334, 673.}}