TY  - RPRT
TI  - Diving into the unknown.
AU  - D Grundy
AU  - P Penny
AU  - L Graham
PY  - 1991
DO  - 10.1136/bmj.302.6778.670
UR  - https://pubmed.ncbi.nlm.nih.gov/2021737/
ID  - 2021737
ER  -