@misc{indiciaeaea9fb1b1312,
  title = {An algorithm for deriving the equations of mathematical physics by symbolic manipulation.},
  author = {Howard, J. C. and Tashjian, H.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690036869},
  note = {Source identifier: 19690036869}
}