@misc{indiciae12f449f6566c,
  title = {Nonlinear sum rules: The three-level and the anharmonic-oscillator models.},
  author = {S Scandolo and F Bassani},
  year = {1992},
  doi = {10.1103/physrevb.45.13257},
  url = {https://pubmed.ncbi.nlm.nih.gov/10001406/},
  note = {Source identifier: 10001406}
}