@misc{indiciae7b52f3274687,
  title = {Quantum cascade lasers without intersubband population inversion.},
  author = {J Faist and F Capasso and C Sirtori and DL Sivco and AL Hutchinson and MS Hybertsen and AY Cho},
  year = {1996},
  doi = {10.1103/physrevlett.76.411},
  url = {https://pubmed.ncbi.nlm.nih.gov/10061450/},
  note = {Source identifier: 10061450}
}