@article{Korbicz:1985,
  author  = "J. Korbicz",
  title   = "State estimation in discrete-time distributed parameter systems under incomplete priori information about the system",
  journal = "Kybernetika",
  volume  = "Vol. 21",
  number  = "no 6",
  pages   = "470--479",
  year    = "1985",
}