TY  - RPRT
TI  - Simplified subtraction.
AU  - J J Crittenden
AU  - C A Stern
PY  - 1966
DO  - 10.2214/ajr.97.2.523
UR  - https://pubmed.ncbi.nlm.nih.gov/5329337/
ID  - 5329337
ER  -