1. 1) Funabiki, K., Muraoka, K., Iijima, T. and Shiomi, K.: NOCTARN: Trajectory Based CNS/ATM Concept for Small Aircraft, Proceedings of 21st Digital Avionics Systems Conference, 2002, pp. 485–492.
2. 2) Ishii, H., Gomi, H., Okuno, Y., Uchida, J. and Tsuchiya, T.: Flight Tests of Helicopter Noise Abatement Operations, 31st European Rotorcraft Forum, Paper #28, 2005.
3. 3) Ishii, H., Okuno, Y. and Funabiki, K.: Flight Experiments for Aircraft Noise Measurement Using “Tunnel-in-the-Sky” Display, AIAA Paper 2002-4880, 2002.
4. 4) Ishii, H., Gomi, H. and Okuno, Y.: Helicopter Flight Tests for BVI Noise Measurement Using an Onboard External Microphone, AIAA Paper 2005-6119, 2005.