TY  - RPRT
TI  - Executive summary? All about validating scales and stages.
AU  - Paul G McDonough
PY  - 2002
DO  - 10.1016/s0015-0282(02)04222-x
UR  - https://pubmed.ncbi.nlm.nih.gov/12414011/
ID  - 12414011
ER  -