@article{Korbicz:2007,
  author  = "J. Korbicz and M. Witczak and V. Puig",
  title   = "LMI-based strategies for designing observers and unknown input observers for non-linear discrete-time systems",
  journal = "Bulletin of the Polish Academy of Sciences : Technical Sciences",
  volume  = "Vol. 55",
  number  = "no 1",
  pages   = "31--42",
  year    = "2007",
}