@misc{indiciae635cd5c00771,
  title = {Beam spread functions calculated using Feynman path integrals},
  author = {Kilgo, Paul and Tessendorf, Jerry},
  year = {2017},
  doi = {10.1016/j.jqsrt.2017.03.030},
  url = {https://www.osti.gov/biblio/1413854},
  note = {Source identifier: 1413854}
}