@misc{graham2004discrete,
  title={A Discrete Fourier Kernel and Fraenkel's Tiling Conjecture},
  author={Ron Graham and Kevin O'Bryant},
  year={2004},
  eprint={math/0407306},
  archivePrefix={arXiv},
  primaryClass={math.NT},
  doi={10.4064/aa118-3-4},
  url={https://arxiv.org/abs/math/0407306}
}