@misc{heerens_the_lower_2002, 
author={Heerens, J.,Pfuff, M.,Hellmann, D.,Zerbst, U.},
title={The lower  bound toughness procedure applied to the EuroFracture Toughness Dataset},
year={2002},
howpublished = {journal article,GKSS report},
note = {Online available at: \url{} (DOI). Heerens, J.; Pfuff, M.; Hellmann, D.; Zerbst, U.: The lower  bound toughness procedure applied to the EuroFracture Toughness Dataset. Engineering Fracture Mechanics. 2002. vol. 69, 483-495.}}