@article{Levkov:1989,
  author  = "S. Levkov and J. Korbicz",
  title   = "Convolution algebra representation of systems described by linear hyperbolic partial differential equations",
  journal = "International Journal of Control",
  volume  = "Vol. 49",
  number  = "no 6",
  pages   = "2029--2044",
  year    = "1989",
}