Le Dantec, Marianne; Rančić, Miloš; Lin, Sen; Billaud, Eric; Ranjan, Vishal; Flanigan, Daniel; Bertaina, Sylvain; Chanelière, Thierry; Goldner, Philippe; Erb, Andreas; Liu, Ren Bao; Estève, Daniel; Vion, Denis; Flurin, Emmanuel; Bertet, Patrice: Twenty-three millisecond electron spin coherence of erbium ions in a natural-abundance crystal. 2021Science Advances: 7. https://www.doi.org/10.1126/sciadv.abj9786