1 J.. Levine, M.A. Weiss, D.D. Davis, D.W. Allan, and D.B. Sullivan, Journal of Research of the National Institute of Standards and Technology 94, (1989).
1 M.A. Weiss, D.W. Allan, D.D. Davis, and J.. Levine, IEEE Transactions on Instrumentation and Measurement 41, (1992).
1 D.W. Allan, D.D. Davis, J.. Levine, M.A. Weiss, N.. Hironaka, and D.. Okayama, in (IEEE, Baltimore, MD, USA, 1990).