TY - GEN AU - Cundiff, Steven AU - Hollberg, Leo C2 - Encyclopedia of Modern Optics | Pages: 82-90 DA - 2004-01-01 LA - en PB - Encyclopedia of Modern Optics | Pages: 82-90 PY - 2004 TI - Absolute optical frequency metrology, ed. by B. Guenther and D. Steel ER -