@article{etna_vol14_pp20-35,
  author  = {D. Calvetti and P. C. Hansen and L. Reichel},
  title   = {L-curve curvature bounds via Lanczos bidiagonalization},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {14},
  year    = {2002},
  pages   = {20--35},
}