Reinhardt, S., Saathoff, G., Karpuk, S., Novotny, C., Huber, G., Zimmermann, M., et al. (2006). Iodine hyperfine structure and absolute frequency measurements at 565, 576, and 585 nm. Optics Communications, 261(2), 282-290. doi:doi:10.1016/j.optcom.2005.12.029.