ALGEBRAIC STRUCTURE OF LINEAR DYNAMICAL SYSTEMS, I. THE MODULE OF Sigma.

@article{Klmn1965ALGEBRAICSO,
  title={ALGEBRAIC STRUCTURE OF LINEAR DYNAMICAL SYSTEMS, I. THE MODULE OF Sigma.},
  author={Rudolf E. K{\'a}lm{\'a}n},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={1965},
  volume={54 6},
  pages={1503-8}
}