@misc{indiciaebeea360750ea,
  title = {Multigrid convergence of an implicit symmetric relaxation scheme},
  author = {Yoon, Seokkwan and Chang, Leon and Kwak, Dochan},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930061054},
  note = {Source identifier: 19930061054}
}