@misc{heerens_influence_of_1993, 
author={Heerens, J.,Schwalbe, K.-H.,Nix, C.},
title={Influence of specimen size on J-, Jm -and ?5-R-Curves for side grooved compact tension specimens},
year={1993},
howpublished = {book part,GKSS report},
note = {Online available at: \url{} (DOI). Heerens, J.; Schwalbe, K.; Nix, C.: Influence of specimen size on J-, Jm -and ?5-R-Curves for side grooved compact tension specimens. In: Hacket, E.; Schwalbe, K.; Dodds, R. (Ed.): ASTM STP. Philadelphia: ASTM. 1993. 429-472.}}