@phdthesis{PhD-Thesis_1999_Dahl,
  address = {Tucson, AZ, USA},
  author = {Dahl, Jon Alan},
  school = {University of Arizona},
  title = {{Positive Anisotropic Scattering Sources for Discrete Ordinate Methods}},
  url = {http://hdl.handle.net/10150/284105},
  year = {1999}
}