@article{etna_vol26_pp161-177,
  author  = {Peter Stange and Andreas Griewank and Matthias Bollh\"ofer},
  title   = {On the efficient update of rectangular LU-factorizations subject to low rank modifications},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {26},
  year    = {2007},
  pages   = {161--177},
}