@article{Ziegler_2018,
title={Lifetime extension of onshore wind turbines: A review covering Germany,
Spain,
Denmark,
and the UK},
volume={82},
ISSN={1364-0321},
url={http://dx.doi.org/10.1016/j.rser.2017.09.100},
DOI={10.1016/j.rser.2017.09.100},
journal={Renewable and Sustainable Energy Reviews},
publisher={Elsevier BV},
author={Ziegler,
Lisa and Gonzalez,
Elena and Rubert,
Tim and Smolka,
Ursula and Melero,
Julio J.},
year={2018},
month=feb,
pages={1261–1271} }