@article{frequencysuperpositionamultifrequency,
  title = {Frequency Superposition -- A Multi-Frequency Stimulation Method in SSVEP-based BCIs},
  author = {Jing Mu and David B. Grayden and Ying Tan and Denny Oetomo},
  year = {2021},
  eprint = {2104.12187},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2104.12187v2},
}