@misc{zerbst_engineering_estimation_1998, 
author={Zerbst, U., Heerens, J., Pfuff, M., Wittkowsky, B. U., Schwalbe, K.-H.},
title={Engineering estimation of the lower bound toughness in the transition regime of ferritic steels},
year={1998},
howpublished = {GKSS report},
note = {Zerbst, U.; Heerens, J.; Pfuff, M.; Wittkowsky, B.; Schwalbe, K.: Engineering estimation of the lower bound toughness in the transition regime of ferritic steels. Fatigue and Fracture of Engineering Materials and Structures. 1998. vol. 21, no. 10, 1273-1278.}}