@misc{indiciaee699d4a1b319,
  title = {Second-order wave equation for spin-(1/2) fields.},
  author = {Cufaro Petroni N and P Gueret and JP Vigier and A Kyprianidis},
  year = {1985},
  doi = {10.1103/physrevd.31.3157},
  url = {https://pubmed.ncbi.nlm.nih.gov/9955646/},
  note = {Source identifier: 9955646}
}