TY  - RPRT
TI  - PPS operating margins: the flip side.
AU  - L M Henikoff
PY  - 1990
DO  - 10.1377/hlthaff.9.2.238-a
UR  - https://pubmed.ncbi.nlm.nih.gov/2365264/
ID  - 2365264
ER  -