@techreport{TechReport_2014_LANL_LA-UR-12-25478Rev.1_MartzCrane,
  address = {Los Alamos, NM, USA},
  author = {Martz, Roger Lee and Crane, David Lee},
  institution = {Los Alamos National Laboratory},
  month = {March},
  number = {LA-UR-12-25478, Rev.~1},
  title = {{The MCNP6 Book on Unstructured Mesh Geometry: Foundations (U)}},
  year = {2014}
}