@misc{heerens_effects_of_1994, 
author={Heerens, J.},
title={Effects of size and geometry of fracture toughness in the upper shelf and transition regime},
year={1994},
howpublished = {conference lecture (invited): Abington (GB);},
note = {Heerens, J.: Effects of size and geometry of fracture toughness in the upper shelf and transition regime. TWI-Seminar: Constraint and the Definition of Upper Shelf Behaviour. Abington (GB), 1994.}}