@TechReport{SCI:She2006a,
  author =    "J.F. Shepherd",
  title =     "Hexahedral Mesh Generation Constraints",
  number =    "UUSCI-2006-010",
  year =      "2006",
  institution = "University of Utah",
  type =      "{SCI} Institute Technical Report",
  url =       "http://www.sci.utah.edu/publications/SCITechReports/UUSCI-2006-010.pdf",
}