@misc{MS14,
  title = {Digital earth system featuring integer-based connectivity mapping of aperture-3 hexagonal cells},
  author = {Ali Mahdavi-Amiri and Faramarz Samavati},
  url={http://www.lens.org/images/patent/US/20140267261/A1/US_2014_0267261_A1.pdf},
  numpages={56},
  year={2014},
  month={Sep 18},
  howpublished={US Patent},
  note={US 20140267261 A1}
}