@misc{indiciae2aa2dae359aa,
  title = {A new approach to high resolution microradiography using extremely soft x-rays.},
  author = {R C GREULICH and A ENGSTROM},
  year = {1956},
  doi = {10.1016/0014-4827(56)90097-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/13294139/},
  note = {Source identifier: 13294139}
}