@misc{indiciaedbfb113d8188,
  title = {Extended projector method: Application to a spin-boson system.},
  author = {M Vanhimbeeck and De Raedt H and D Schoemaker},
  year = {1987},
  doi = {10.1103/physreva.36.4612},
  url = {https://pubmed.ncbi.nlm.nih.gov/9898720/},
  note = {Source identifier: 9898720}
}