50 Jahre atomare Definition der Sekunde ; 50 Years of the Atomic Definition of the Second

Jörn Stenger, Johannes Graf, Andreas Bauch, Peter Whibberley, Michael Lombardi, Gerhard Beutler, Claus Kiefer & Ekkehard Peik
PTB-Mitteilungen, Band 127 (2017), Heft 3. ISSN 0030-834X
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