@misc{kristoufek2013commodity,
  title={Commodity futures and market efficiency},
  author={Ladislav Kristoufek and Miloslav Vosvrda},
  year={2013},
  eprint={1309.1492},
  archivePrefix={arXiv},
  primaryClass={q-fin.ST},
  url={https://arxiv.org/abs/1309.1492}
}