@ARTICLE{Ling+Schaback-imprsubsselealgo:09,
  author       = {Ling, L. and Schaback, R.},
  title        = {An improved subspace selection algorithm for meshless collocation methods},
  journal      = {Int. J. Numer. Methods Eng.},
  fjournal     = {International Journal for Numerical Methods in Engineering},
  volume       = {80},
  number       = {13},
  pages        = {1623-1639},
  year         = {2009},
}