@misc{heerens_interpretation_of_1991, 
author={Heerens, J., Read, D. T., Cornec, A., Schwalbe, K.-H.},
title={Interpretation of fracture toughness in the ductile to brittle transition region by fractographical observations},
year={1991},
howpublished = {conference lecture: Freiburg (D);},
note = {Heerens, J.; Read, D.; Cornec, A.; Schwalbe, K.: Interpretation of fracture toughness in the ductile to brittle transition region by fractographical observations. In: Blauel, J.; Schwalbe, K. (Ed.): Defect Assessment in Components: Fundamentals and Applications; Proceedings of the European Symposium on Elastic-Plastic Fracture Mechanics. Freiburg (D). 1991. 659-678.}}