@misc{indiciae89947fc8da8e,
  title = {Formally biorthogonal polynomials and a look-ahead Levinson algorithm for general Toeplitz systems},
  author = {Freund, Roland W. and Zha, Hongyuan},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19940009113},
  note = {Source identifier: 19940009113}
}