@misc{michaelsen_improved_graded_2000, 
author={Michaelsen, C.,Goebel, H.},
title={Improved Graded Multilayer Mirrors for XRD Applications},
year={2000},
howpublished = {journal article},
note = {Online available at: \url{} (DOI). Michaelsen, C.; Goebel, H.: Improved Graded Multilayer Mirrors for XRD Applications. Advances in X-Ray Analysis. 2000. vol. 42, 308.}}