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2. Lacagnina, M., “Difusing the ramp”, Aerosafety world, 2(5), 2007, pp.20-24
3. Flight Safety Foundation “Ground Accident Prevention(GAP)”, 2018 [Available from: https://flightsafety.org/toolkits-resources/past-safety-initiatives/ground-accident-prevention-gap/]
4. National Law information center “Aviation Act” 2017 [cited 2018 Feb 5]; [Available from: . http://www.law.go.kr/국가항공안전프로그램/. Accessed Feb 2018]
5. ICAO, “Safety Management Document (DOC9859)”, Montreal, 2013, pp.xii, 4-9