@misc{indiciaeb4bb6885ffce,
  title = {Spectral multigrid methods for elliptic equations},
  author = {Zang, T. A. and Wong, Y. S. and Hussaini, M. Y.},
  year = {1982},
  url = {https://ntrs.nasa.gov/citations/19830048445},
  note = {Source identifier: 19830048445}
}