TY  - RPRT
TI  - Helium at nonzero temperatures: A variational density-matrix approach for Bose fluids.
AU  - G Senger
AU  - ML Ristig
AU  - KE Kürten
AU  - CE Campbell
PY  - 1986
DO  - 10.1103/physrevb.33.7562
UR  - https://pubmed.ncbi.nlm.nih.gov/9938121/
ID  - 9938121
ER  -