German Validation Study: Gloster, A.T. et al (2021) Psy-Flex: A contextually sensitive measure of psychological flexibility. Journal of Contextual Behavioral Science, 22, 13-23. https://doi.org/10.1016/j.jcbs.2021.09.001
The Psy-Flex German version is available at https://psychologie.unibas.ch/en/faculty/centers/clinical-psychology-and-intervention-science/research/research-projects/psy-flex/#c24662