J. G. Hartnett

Ultra-Stable Very-Low Phase-Noise Signal Source for Very Long Baseline Interferometry Using a Cryocooled Sapphire Oscillator

G. Santarelli, J. Hartnett, N. Nand, 2011, IEEE Transactions on Microwave Theory and Techniques.

Generation of 103.75 GHz CW Source With $5.10^{-16}$ Frequency Instability Using Cryogenic Sapphire Oscillators

P. L. Stanwix, M. E. Tobar, J. Hartnett, 2012, IEEE Microwave and Wireless Components Letters.

Development of the cesium fountain frequency standard, NMIJ-F2

K. Watabe, S. Yanagimachi, A. Takamizawa, 2014, 2014 European Frequency and Time Forum (EFTF).

Progress in the development of cryogenic sapphire resonator oscillator at NMIJ/AIST

G. Santarelli, S. Ohshima, K. Watabe, 2006, Proceedings of the 20th European Frequency and Time Forum.

Cryogenic sapphire oscillator with exceptionally high long-term frequency stability

P. L. Stanwix, M. E. Tobar, J. G. Hartnett, 2006 .