@misc{stoermer_features_of_2006, 
author={Stoermer, M.},
title={Features of FEL optics},
year={2006},
howpublished = {conference lecture (invited): Hamburg (D);},
note = {Stoermer, M.: Features of FEL optics. Damage threshold of Mirrors and Multilayers, Meeting on Future XFEL optics. Hamburg (D), 2006.}}