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http://human-factors.arc.nasa.gov/flightcognition/download/EAS_Symposium_Presentations/LOSA.pdf
5. Etherington, T.J., Kramer, L.J., Kennedy, K.D., Bailey, R.E., Stephens, C.L.: Quantifying pilot contribution to flight safety for normal and non-normal airline operations. In: Paper Presented at AIAA Digital Avionics Systems Conference, October 2016