TY  - RPRT
TI  - Marginal analysis in practice.
AU  - A Mordue
AU  - N Craig
PY  - 1994
DO  - 10.1136/bmj.309.6966.1438b
UR  - https://pubmed.ncbi.nlm.nih.gov/7819865/
ID  - 7819865
ER  -