TY  - RPRT
TI  - Defining dependence.
AU  - J Birtchnell
PY  - 1988
DO  - 10.1111/j.2044-8341.1988.tb02770.x
UR  - https://pubmed.ncbi.nlm.nih.gov/3042012/
ID  - 3042012
ER  -