@misc{ernst_modified_j_1988, 
author={Ernst, H. A., Schwalbe, K.-H., Hellmann, D., McCabe, D. E.},
title={Modified J, JM, resistance curves under plane stress conditions},
year={1988},
howpublished = {GKSS report},
note = {Ernst, H.; Schwalbe, K.; Hellmann, D.; McCabe, D.: Modified J, JM, resistance curves under plane stress conditions. International Journal of Fracture. 1988. vol. 37, no. 2, 83-100.}}