TY  - RPRT
TI  - Access controls on bmj.com: dual models are possible.
AU  - Gunther Eysenbach
PY  - 2005
DO  - 10.1136/bmj.330.7501.1211-a
UR  - https://pubmed.ncbi.nlm.nih.gov/15905270/
ID  - 15905270
ER  -