@incollection{iiasa14157,
          volume = {100},
          series = {International Series of Numerical Mathematics},
       booktitle = {Estimation and Control of Distributed Parameter Systems},
          editor = {W. Desch and F. Kappel and K. Kunisch},
         address = {Basel, Switzerland},
           title = {The state estimation problem for parabolic systems},
       publisher = {Birkh{\"a}user},
            year = {1991},
             doi = {10.1007/978-3-0348-6418-3\_16},
           pages = {219--246},
        keywords = {observers; observability; sensors; state estimation; distributed parameter systems},
             url = {https://pure.iiasa.ac.at/id/eprint/14157/},
            isbn = {978-3-0348-6418-3},
            issn = {0373-3149},
        abstract = {This paper introduces a series of problems on state estimation for parabolic systems on the basis of measurements generated by sensors in the presence of unknown but bounded disturbances. Observability issues, guaranteed filtering schemes for distributed processes are discussed.},
          author = {Kurzhanski, A. B. and Khapalov, A. Y.}
}