1. “X-ray Microscopy and Microradiography”;Engström,1957
2. “X-ray Microscopy and Microanalysis”;Greulich,1960
3. A new approach to high resolution microradiography using extremely soft X-rays
4. “X-ray Microscopy and Microradiography”;Hallén,1957
5. Henke, B. L. (1963). This volume, p. 157.