@article{824681, author = {K Vogel and Scott Diddams and Christopher Oates and E Curtis and R Rafac and James Bergquist and Richard Fox and W Lee and Leo Hollberg}, title = {Direct Comparison of Two Cold-Atom-Based Optical Frequency Standards by Using a Femtosecond-Laser Comb}, year = {2001}, number = {26}, month = {2001-01-01 00:01:00}, publisher = {Optics Letters}, language = {en}, }