Improving Our Knowledge on the 229m Thorium Isomer: Toward a Test Bench for Time Variations of Fundamental Constants Thirolf, Peter G. ; Seiferle, Benedict ; der Wense, Lars Abstract Publication: Annalen der Physik Pub Date: May 2019 DOI: 10.1002/andp.201800381 Bibcode: 2019AnP...53100381T