TY  - RPRT
TI  - The Wave-Lengths of Secondary X-Rays (Second note).
AU  - G L Clark
AU  - W Duane
PY  - 1923
DO  - 10.1073/pnas.9.12.419
UR  - https://pubmed.ncbi.nlm.nih.gov/16586921/
ID  - 16586921
ER  -