@misc{indiciae7c9aa96c1223,
  title = {An angular multigrid method for computing mono-energetic particle beams in Flatland},
  author = {Boergers, Christoph and MacLachlan, Scott},
  year = {2010},
  doi = {10.1016/j.jcp.2009.12.023},
  url = {https://www.osti.gov/biblio/21333944},
  note = {Source identifier: 21333944}
}