@misc{indiciae0a8262c77cee,
  title = {Herglotz-Noether theorem in conformal space- time.},
  author = {Estabrook, F. B. and Wahlquist, H. D.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670054200},
  note = {Source identifier: 19670054200}
}