@misc{schwalbe_fracture_mechanics_1999, 
author={Schwalbe, K.-H.},
title={Fracture Mechanics and Fatigue I},
year={1999},
howpublished = {lecture: TU Hamburg-Harburg, FB Maschinenbau;},
note = {Schwalbe, K.: Fracture Mechanics and Fatigue I. TU Hamburg-Harburg, FB Maschinenbau, 1999.}}