@article{etna_vol5_pp77-97,
  author  = {Volker Mehrmann and Hongguo Xu},
  title   = {An analysis of the pole placement problem II. The multi-input case},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {5},
  year    = {1997},
  pages   = {77--97},
}