@misc{bickel2013physical,
  title={Physical reproduction of reflectance fields},
  author={BICKEL, B. and Alexa, M. and Kautz, J. and Matusik, W. and Pece, F.},
  url={http://www.google.com/patents/US20130016100},
  year={2013},
  month=jan # "~17",
  publisher={Google Patents},
  note={US Patent App. 13/608,819}
}