@article{Shefali:2019rR,
  author = "Shefali, S.  and  Heinen, Dirk  and  Turcotte, Roxanne  and  Weinstock, Lars Steffen  and  Wiebusch, Christopher  and  Zierke, Simon",
  title = "{An Acoustic Calibration System for the IceCube Upgrade}",
  doi = "10.22323/1.358.1030",
  journal = "PoS",
  year = 2019,
  volume = "ICRC2019",
  pages = "1030"
}