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@Article { ,
   title = {139 GHz UV phase-locked Raman laser system for thermometry and sideband cooling of 9Be+ ions in a Penning trap},
   year = {2021},
   web_url = {https://arxiv.org/abs/2106.13532},
   author = {Mielke, J. and Pick, J. and Coenders, J. A. and Meiners, T. and Niemann, M. and Cornejo, J. M. and Ulmer, S. and Ospelkaus, C.}
}