TY  - RPRT
TI  - A new approach to high resolution microradiography using extremely soft x-rays.
AU  - R C GREULICH
AU  - A ENGSTROM
PY  - 1956
DO  - 10.1016/0014-4827(56)90097-0
UR  - https://pubmed.ncbi.nlm.nih.gov/13294139/
ID  - 13294139
ER  -