@incollection{iiasa14163,
          volume = {185},
          series = {Lecture Notes in Control and Information Sciences},
       booktitle = {Analysis and Optimization of Systems: State and Frequency Domain Approaches for Infinite-Dimensional Systems},
         address = {Germany},
           title = {Observability of hyperbolic systems with interior moving sensors},
       publisher = {Springer Berlin Heidelberg},
            year = {1993},
             doi = {10.1007/BFb0115047},
           pages = {489--499},
             url = {https://pure.iiasa.ac.at/id/eprint/14163/},
            isbn = {978-3-540-47480-7},
          author = {Khapalov, A. Yu.}
}