@misc{schwalbe_the_engineering_1991, 
author={Schwalbe, K.-H.,Cornec, A.,Heerens, J.},
title={The engineering treatment model (ETM): a simple method for estimating the driving force under elastic-plastic and plane stress conditions},
year={1991},
howpublished = {conference paper,conference lecture: Freiburg (D); 1991},
note = {Online available at: \url{} (DOI). Schwalbe, K.; Cornec, A.; Heerens, J.: The engineering treatment model (ETM): a simple method for estimating the driving force under elastic-plastic and plane stress conditions. In: Blauel, J.; Schwalbe, K. (Ed.): Defect assessment in components: fundamentals and applications; Proceedings of the European Symposium on Elastic-Plastic Fracture Mechanics: Elements of Defect Assessment. Freiburg (D). 1991. 1111-1124.}}