@misc{indiciaef80190cda3a5,
  title = {Algebraic methods for control system analysis and design Final report, Apr. 1967 - Apr. 1969},
  author = {Siljak, D. D. and Thaler, G. J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690022313},
  note = {Source identifier: 19690022313}
}