@article{248641,
  author = {William McGrew and Xiaogang Zhang and Robert Fasano and Holly Leopardi and Daniele Nicolodi and Kyle Beloy and Jian Yao and Jeffrey Sherman and Stefan Schaeffer and Joshua Savory and Stefania Romisch and Christopher Oates and Thomas Parker and Tara Fortier and Andrew Ludlow},
  title = {Towards the optical second: verifying optical clocks at the SI limit},
  year = {2019},
  month = {2019-04-11},
  publisher = {Physical Review X},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926906},
  language = {en},
}