@misc{indiciae30ed8c36dece,
  title = {Two-stream instability in two-dimensional degenerate systems.},
  author = {R Gupta and BK Ridley},
  year = {1989},
  doi = {10.1103/physrevb.39.6208},
  url = {https://pubmed.ncbi.nlm.nih.gov/9949049/},
  note = {Source identifier: 9949049}
}