Optical frequency synthesis with 1 Hz resolution. - Andre N. Luiten; Richard P. Kovacich; John J. McFerran (IEEE Trans. Instrum. Meas., 1999)

Cold strontium atoms for an optical frequency standard. - Irène Courtillot; Audrey Quessada; Richard P. Kovacich; Jean-Jacques Zondy; Arnaud Landragin; Giorgio Santarelli; André Clairon; Pierre Lemonde (IEEE Trans. Instrum. Meas., 2003)