@misc{indiciae342c63d991d2,
  title = {Approximating the Helium Wavefunction in Positronium-Helium Scattering},
  author = {DiRienzi, Joseph and Drachman, Richard J.},
  year = {2003},
  url = {https://ntrs.nasa.gov/citations/20040030512},
  note = {Source identifier: 20040030512}
}