1. Leishman JG (2006) Principles of helicopter aerodynamics, 2nd edn. Cambridge University Press, New York, pp 692–722
2. Mitchell C, Vogel B (2003 The canard rotor wing (CRW) aircraft-a new way to fly. In: AIAA international air and space symposium and exposition: the next 100 years, AIAA paper 2003–2517, July 2003
3. Davidson IM, Harcest TJ (1965) Helicopter noise. Aeronaut J 69(653):325–336. https://doi.org/10.1017/S0001924000059583
4. Walsh GD (2016) A preliminary acoustic investigation of a coaxial helicopter in high-speed flight. Master Thesis, Aerospace Engineering Dept., The Pennsylvania State Univ., Philadelphia
5. Ko J, Lee S (2018) Wake optimized CFD method for wake structure and noise analysis of the coaxial rotor. In: 7th Asian/Australian rotorcraft forum, Jeju Island, Korea, 30 Oct–1 Nov 2018