@misc{indiciae028b22692893,
  title = {Gapping fields on sloping surfaces.},
  author = {R Keys and P W Grigsby},
  year = {1990},
  doi = {10.1016/0360-3016(90)90456-t},
  url = {https://pubmed.ncbi.nlm.nih.gov/2347725/},
  note = {Source identifier: 2347725}
}