TY  - RPRT
TI  - Letter: Nitrous-oxide asphyxia.
AU  - P J Helliwell
PY  - 1974
DO  - 10.1016/s0140-6736(74)90659-x
UR  - https://pubmed.ncbi.nlm.nih.gov/4136957/
ID  - 4136957
ER  -