@article{fromthesamuelsonvolatilityeffecttoa,
  title = {From the Samuelson Volatility Effect to a Samuelson Correlation Effect: Evidence from Crude Oil Calendar Spread Options},
  year = {2015},
  eprint = {1401.7913},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1401.7913v3},
}