@misc{indiciae7b480d0fe455,
  title = {General relaxation schemes in multigrid algorithms for higher order singularity methods},
  author = {Oskam, B. and Fray, J. M. J.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810025347},
  note = {Source identifier: 19810025347}
}