@misc{indiciae82cec0553927,
  title = {On-line simulation of block-diagram systems.},
  author = {Dertouzos, M. L. and Kaliski, M. E. and Polzen, K. P.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690053720},
  note = {Source identifier: 19690053720}
}