@conference{206961, author = {Till Rosenband and David Hume and Anders Brusch and Luca Lorini and P. Schmidt and Tara Fortier and Jason Stalnaker and Scott Diddams and Nathan Newbury and W Swann and Windell Oskay and Wayne Itano and David Wineland and James Bergquist}, title = {Frequency Comparison of Al+ and Hg+ Optical Standards}, year = {2007}, month = {2007-06-24}, publisher = {Proc. 2007 ICOLS Meeting, Telluride, CO}, url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50640}, language = {en}, }