TY  - RPRT
TI  - Approximating the Helium Wavefunction in Positronium-Helium Scattering
AU  - DiRienzi, Joseph
AU  - Drachman, Richard J.
PY  - 2003
UR  - https://ntrs.nasa.gov/citations/20040030512
ID  - 20040030512
ER  -