@article{etna_vol3_pp1-23,
  author  = {M. Van Barel and A. Bultheel},
  title   = {Orthonormal polynomial vectors and least squares approximation for a discrete inner product},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {3},
  year    = {1995},
  pages   = {1--23},
}