TY  - RPRT
TI  - Category "A" operations for twin-engine helicopters.
AU  - C Lunaas
PY  - 1991
DO  - 10.1016/s1046-9095(05)80504-5
UR  - https://pubmed.ncbi.nlm.nih.gov/10115691/
ID  - 10115691
ER  -