Lemonde

Measurement of the hydrogen 1S- 2S transition frequency by phase coherent comparison with a microwave cesium fountain clock

Salomon, Reichert, Weitz, 2000, Physical review letters.

Laser cooling of cesium atoms in gray optical molasses down to 1.1 microK.

Michaud, Salomon, Weyers, 1996, Physical review. A, Atomic, molecular, and optical physics.