@article {GreifVarah2006,
    AUTHOR = {Greif, Chen and Varah, James M.},
     TITLE = {Minimizing the condition number for small rank modifications},
   JOURNAL = {SIAM J. Matrix Anal. Appl.},
    VOLUME = {29},
      YEAR = {2006/07},
    NUMBER = {1},
     PAGES = {82--97}
}