@article {BGS06,
  author      = {Richard H. Bartels and
                 Gene H. Golub and 
                 Faramarz F. Samavati},
  affiliation = {University of Waterloo, School of Computer Science Waterloo Ontario Canada N2L 3G1},
  title       = {Some observations on local least squares},
  journal     = {BIT Numerical Mathematics},
  publisher   = {Springer Netherlands},
  issn        = {0006-3835},
  volume      = {46},
  issue       = {3},
  year        = {2006},
  pages       = {455-477},
  doi         = {http://dx.doi.org/10.1007/s10543-006-0075-y}
}