Spaces for Which the Ricci Scalar R Is Equal to Zero.

@article{Eisenhart1958SpacesFW,
  title={Spaces for Which the Ricci Scalar R Is Equal to Zero.},
  author={L P Eisenhart},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={1958},
  volume={44 7},
  pages={695-8}
}
  • L P Eisenhart
  • Published 1958 in
    Proceedings of the National Academy of Sciences…