@article{etna_vol25_pp1-16,
  author  = {Len Bos and Marco Caliari and Stefano De Marchi and Marco Vianello},
  title   = {Bivariate interpolation at Xu points: results, extensions and applications},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {25},
  year    = {2006},
  pages   = {1--16},
}