TY  - RPRT
TI  - Statistics Notes: Validating scales and indexes.
AU  - J Martin Bland
AU  - Douglas G Altman
PY  - 2002
DO  - 10.1136/bmj.324.7337.606
UR  - https://pubmed.ncbi.nlm.nih.gov/11884331/
ID  - 11884331
ER  -