@conference{798956, author = {R Rafac and B Young and F Cruz and J Beall and James Bergquist and Wayne Itano and David Wineland}, title = {Progress Towards 199Hg+ Optical Frequency Standard}, year = {1999}, month = {1999-04-13 00:04:00}, publisher = {Joint Mtg. 13^uth^ European Frequency and Time Forum and 1999 IEEE Int. Freq. Cont. Symp. , Besan{c-cedilla}on, 1, FR}, url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=105547}, language = {en}, }