A thorium-229 optical nuclear clock with feedback loop.

Toscani De Col L Riebner T Morawetz I Schneider F Sempelmann N Schlachet-Lépinay J Schaden F Bartokos M Kazakov GA Beeks K Gerstenecker B Pimon M Lahs S Hellerschmied A Lercher T Denker H Premper J Niessner A Matus M Čížek M Číp O Lal V Zitzer G Petrov V Tiedau J Okhapkin MV Peik E Schumm T