@misc{indiciae00899784daa3,
  title = {Unitarity cusp in proton Compton scattering.},
  author = {JC Bergstrom and EL Hallin},
  year = {1993},
  doi = {10.1103/physrevc.48.1508},
  url = {https://pubmed.ncbi.nlm.nih.gov/9968993/},
  note = {Source identifier: 9968993}
}