@misc{indiciaed97b241b547f,
  title = {The Harmonic Operator for Exterior Differential Forms.},
  author = {M P Gaffney},
  year = {1951},
  doi = {10.1073/pnas.37.1.48},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588988/},
  note = {Source identifier: 16588988}
}