@misc{schwalbe_rcurve_testing_1998, 
author={Schwalbe, K.-H.,Heerens, J.},
title={R-curve testing and its relevance to structural assessment},
year={1998},
howpublished = {journal article,GKSS report},
note = {Online available at: \url{} (DOI). Schwalbe, K.; Heerens, J.: R-curve testing and its relevance to structural assessment. Fatigue and Fracture of Engineering Materials and Structures. 1998. vol. 21, no. 10, 1259-1272.}}