@ARTICLE{Brown+LingETAL-apprcardprecmeth:05,
  author       = {Brown, D. and Ling, L. and Kansa, E. and Levesley, J.},
  title        = {On approximate cardinal preconditioning methods for solving {PDE}s with radial basis functions},
  journal      = {Eng. Anal. Bound. Elem.},
  fjournal     = {Engineering Analysis with Boundary Elements},
  volume       = {29},
  number       = {4},
  pages        = {343-353},
  year         = {2005},
}