TY  - RPRT
TI  - Helmets and helicopter safety.
AU  - K N Hall
AU  - M A Wakeman
PY  - 1992
DO  - 10.1097/00043764-199203000-00008
UR  - https://pubmed.ncbi.nlm.nih.gov/1545276/
ID  - 1545276
ER  -