A microwave frequency reference based on VCSEL-driven dark line resonances in Cs vapor. - John Kitching; Svenja Knappe; M. Vukicevic; Leo Hollberg; Robert Wynands; W. Weidmann (IEEE Trans. Instrum. Meas., 2000)

Characterization of a cold cesium source for PARCS: Primary Atomic Reference Clock in Space. - Thomas P. Heavner; Leo Hollberg; Steven R. Jefferts; John Kitching; W. M. Klipstein; D. M. Meekhof; Hugh G. Robinson (IEEE Trans. Instrum. Meas., 2001)

Optical frequency standards based on the 199Hg+ ion. - U. Tanaka; James C. Bergquist; Sebastien Bize; Scott A. Diddams; R. E. Drullinger; Leo Hollberg; Wayne M. Itano; Carol E. Tanner; David J. Wineland (IEEE Trans. Instrum. Meas., 2003)

International comparisons of femtosecond laser frequency combs. - Long Sheng Ma; Zhiyi Bi; Albrecht Bartels; Lennart Robertsson; Massimo Zucco; Robert Windeler; Guido Wilpers; Chris Oates; Leo Hollberg; Scott A. Diddams (IEEE Trans. Instrum. Meas., 2005)

Laser Noise Cancellation in Single-Cell CPT Clocks. - Vladislav Gerginov; Svenja Knappe; Vishal Shah; Leo Hollberg; John Kitching (IEEE Trans. Instrum. Meas., 2008)