@misc{schwalbe_fracture_mechanics_1999, 
author={Schwalbe, K.-H.},
title={Fracture Mechanics and Fatigue II},
year={1999},
howpublished = {lecture: TUHH, FB Maschinenbau; SS 1999},
note = {Online available at: \url{} (DOI). Schwalbe, K.: Fracture Mechanics and Fatigue II. TUHH, FB Maschinenbau, 1999.}}