@phdthesis{PhD-Thesis_1999_Barrett,
  address = {Ann Arbor, MI, USA},
  author = {Carla Lynn Barrett},
  school = {University of Michigan},
  title = {{A Variationally-based Variance Reduction Method for Monte Carlo Particle Transport Problems}},
  url = {https://hdl.handle.net/2027.42/132073},
  year = {1999}
}