TY  - RPRT
TI  - Diving into the unknown.
AU  - C L Gibbons
AU  - A D McLain
AU  - A H Simpson
PY  - 1991
DO  - 10.1136/bmj.302.6782.963-c
UR  - https://pubmed.ncbi.nlm.nih.gov/2032049/
ID  - 2032049
ER  -