Perspective: Time scales and clocks: ''Invited Review Article: The statistical modeling of atomic clocks and the design of time scales'' [Rev. Sci. Instrum. 83, 021101 (2012)] and ''Invited Review Article: The uncertainty in the realization and dissemination of the SI second from a systems point of view'' [Rev. Sci. Instrum. 83, 021102 (2012)]
No abstract prepared.