* Interacting with Computers, Volume 31, Issue 3, May 2019, pp.
231-249 * 46 pages, 5 figures, preprint, final version published in IWC Access Paper or Ask Questions
* 10 pages, 2 figures, preprint, final version to appear in KI -
K\"unstliche Intelligenz, Special Issue: Intentional Forgetting Access Paper or Ask Questions