@article{semerikov2018compact,
  title={Compact Transportable Optical Standard Based on a Single 171 Yb+ Ion (“YBIS” Project)},
  author={Semerikov, IA and Khabarova, K Yu and Zalivako, IV and Borisenko, AS and Kolachevsky, NN},
  journal={Bulletin of the Lebedev Physics Institute},
  volume={45},
  number={11},
  pages={337--340},
  year={2018},
  publisher={Springer},
  url={https://doi.org/10.3103/S1068335618110039}
}