TY  - RPRT
TI  - Defining the indefinable: comments on Smith.
AU  - Heather Ashton
PY  - 2002
DO  - 10.1046/j.1360-0443.2002.t01-2-00060.x
UR  - https://pubmed.ncbi.nlm.nih.gov/12084147/
ID  - 12084147
ER  -