TY  - RPRT
TI  - A phantom for beam positioning and visualization.
AU  - M K Woo
AU  - S Wong
PY  - 1993
DO  - 10.1016/0360-3016(93)90290-c
UR  - https://pubmed.ncbi.nlm.nih.gov/8331002/
ID  - 8331002
ER  -