%0 conference lecture %@ %A Anuschewski, W., Dietzel, W., Horstmann, M., Pfuff, M., Wellenkoetter, B. %D 1990 %J Hydrogen effects on material behaviour: Proceedings of the Fourth International Conference on the Effect of Hydrogen on the Behaviour of Materials %P 929-937 %T AC potential measurement of hydrogen-induced geometrical crack closure during fatigue crack growth %U %X