TY  - RPRT
TI  - A simple accurate plane and incline indicator.
AU  - A L L BELL
AU  - J ZWANGER
PY  - 1952
DO  - 10.1148/58.2.259
UR  - https://pubmed.ncbi.nlm.nih.gov/14892255/
ID  - 14892255
ER  -