D. Schrage, M. Costello, D. Mittleider, Design concepts for an advanced cargo rotorcraft, Journal of the American Helicopter Society, 34(4) (1989) 56-65.
 A. Antoniadis, D. Drikakis, B. Zhong, G. Barakos, R. Steijl, M. Biava, L. Vigevano, A. Brocklehurst, O. Boelens, M. Dietz, Assessment of CFD methods against experimental flow measurements for helicopter flows, Aerospace Science and Technology, 19(1) (2012) 86-100.
J.Y. Hwang, O.J. Kwon, Assessment of S-76 rotor hover performance in ground effect using an unstructured mixed mesh method, Aerospace Science and Technology, 84 (2019) 223-236.
 M. Ramasamy, M. Potsdam, G.K. Yamauchi, Measurements to Understand the Flow Mechanisms Contributing to Tandem-Rotor Outwash, (2018).
 J. Leishman, Principles of Helicopter Aerodynamics, CambridgeUniv, Press, New, (2000).
 D. Shukla, N. Komerath, Multirotor Drone Aerodynamic Interaction Investigation, Drones, 2(4) (2018) 43.
 D.A. Peters, S.Y. Chen, Momentum Theory, Dynamic Inflow, and the Vortex‐Ring State, Journal of the American Helicopter Society, 27(3) (1982) 18-24.
 W. Stepniewski, A simplified approach to the aerodynamic rotor interference of tandem helicopters, in: Proc Annu Western Forum, 1955, pp. 71-90.
 W.Z. Stepniewski, C. Keys, Rotary-wing aerodynamics, Courier Corporation, 1984.
 24-ft Wind Tunnel Tests of Model Multi-Rotor Helicopters, RAE Report No. Aero 2207, 1947.
 G.E. Sweet, Hovering measurements for twin-rotor configurations with and without overlap, (1960).
 R.C. Dingeldein, Wind-tunnel studies of the performance of multirotor configurations, (1954).
 F.D. Harris, Twin rotor hover performance, Journal of the American helicopter society, 44(1) (1999) 34- 37.
 M. Knight, R.A. Hefner, Static thrust analysis of the lifting airscrew, (1937).
 M.K. Taylor, A balsa-dust technique for air-flow visualization and its application to flow through model helicopter rotors in static thrust, (1950).
 E.A. Fradenburgh, Flow Field Measurements for a Hovering Rotor Near the Ground, in: Fifth Annual Western Forum, Los Angeles, CA, 1958.
 W. Schane, Effects of Downwash Upon Man, ARMY AEROMEDICAL RESEARCH UNIT FORT RUCKER AL, 1967.
 J.R. Preston, S. Troutman, E. Keen, M. Silva, N.Whitman, M. Calvert, M. Cardamone, M. Moulton, S.W. Ferguson, Rotorwash Operational Footprint Modeling, MISSILE RESEARCH DEVELOPMENT AND ENGINEERING CENTER REDSTONE ARSENAL AL …, 2014.
 W. Brady, G.R. Ludwig, TheoreticalAnd Experimental Studies Of Impinging Uniform And Nonuniform Jets, Cornell Aeronautical Lab Inc Buffalo Ny, 1964.
 R.E. Kuhn, An investigation to determine conditions under which downwash from VTOL aircraft will start surface erosion from various types of terrain, National Aeronautics and Space Administration, 1959.
 P. Hrycak, Experimental flow characteristics of a single turbulent jet impinging on a flat plate, National Aeronautics and Space Administration, 1970.
 M. Glauert, The wall jet, Journal of Fluid Mechanics, 1(6) (1956) 625-643.
 P.R. Spalart, On the flow field induced by a hovering rotor or a static jet, Journal of Fluid Mechanics, 701 (2012) 473-481.
 A.J. Wadcock, L.A. Ewing, E. Solis, M. Potsdam, G. Rajagopalan, Rotorcraft downwash flow field study to understand the aerodynamics of helicopter brownout, NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH …, 2008.
 A. Radhakrishnan, F. Schmitz, An experimental investigation of a quad tilt rotor in ground effect, in: 21st AIAA Applied Aerodynamics Conference, 2003, pp. 3517.
 F.F. Felker, J.S. Light, Aerodynamic interactions between a rotor and wing in hover, Journal of the American Helicopter Society, 33(2) (1988) 53-61.
 C. Phillips, H.W. Kim, R.E. Brown, The flow physics of helicopter brownout, in: 66th American Helicopter Society Forum: Rising to New Heights in Vertical Lift Technology, 2010.
 C. Phillips, R.E. Brown, Eulerian simulation of the fluid dynamics of helicopter brownout, Journal of Aircraft, 46(4) (2009) 1416-1429.
 D.P. Garrick, R.G. Rajagopalan, K. Guntupalli, Simulation of Landing Maneuvers of Rotorcraft in Brownout Conditions, in: 2013 International Powered Lift Conference, 2013, pp. 4266.
 J.F. Tan, T.Y. Zhou, Y.M. Sun, G.N. Barakos, Numerical investigation of the aerodynamic interaction between a tiltrotor and a tandem rotor during shipboard operations, Aerospace Science and Technology, 87 (2019) 62-72.
 M. Derby, G. Yamauchi, Design of 1/48th-scale models for ship/rotorcraft interaction studies, in: 21st AIAA Applied Aerodynamics Conference, 2003, pp. 3952.
 B. Johnson, J.G. Leishman, A. Sydney, Investigation of Sediment Entrainment Using Dual‐Phase, High‐ Speed Particle Image Velocimetry, Journal of the American Helicopter Society, 55(4) (2010) 42003- 42003.
 M. George, E. Kisielowski, D. Douglas, Investigation of the Downwash Environment generated by V/STOL Aircraft operating in Ground Effect, DYNASCIENCES CORP BLUE BELL PA, 1968.
 J. Milluzzo, J.G. Leishman, Assessment of rotorcraft brownout severity in terms of rotor design parameters, Journal of the American Helicopter Society, 55(3) (2010) 32009-32009.
 D.J. Hohler, An Analytical Method of Determining General Downwash Flow Field Parameters for V/ STOL Aircraft, AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OH, 1966.
 M. Silva, R. Riser, CH-47D tandem rotor outwash survey, in: AHS 67th Annual Forum, 2011.
 J.-f. Tan, H.-w. Wang, Simulating unsteady aerodynamics of helicopter rotor with panel/viscous vortex particle method, Aerospace Science and Technology, 30(1) (2013) 255-268.
 F. Shahmiri, " Experimental investigation of the hovering performance of a twin-rotor test model," Journal of Aerospace Science and Technology (JAST), vol.10, no. 2, pp.1-7, 2013.
 A. Halliday, D. Cox, Wind Tunnel Experiments on a Model of a Tandem Rotor Helicopter, HM Stationery Office, 1961.
 F. Handbook, 8083-21, Rotorcraft Flying Handbook, (2000).
 J. Seddon, S. Newman, Basic helicopter aerodynamics, American Institute of Aeronautics and Astronautics, 2001.
 J.G. Leishman, A. Baker, A. Coyne, Measurements of rotor tip vortices using three‐component laser Doppler velocimetry, Journal of the American Helicopter Society, 41(4) (1996) 342-353.
 W. Johnson, Helicopter theory, Courier Corporation, 2012.
 T.E. Lee, J.G. Leishman, M. Ramasamy, Fluid dynamics of interacting blade tip vortices with a ground plane, Journal of the American Helicopter Society, 55(2) (2010) 22005-22005.
 J. Wolkovitch, Analytical Prediction of Vortex‐Ring Boundaries for Helicopters in Steep Descents, Journal of the American Helicopter Society, 17(3) (1972) 13- 19.
 A. AZUMA, Induced flow variation of the helicopter rotor operating in the vortex ring state, Journal of Aircraft, 5(4) (1968) 381-386.
 J. Stack, F.X. Caradonna, Ö. Savaş, Flow visualizations and extended thrust time histories of rotor vortex wakes in descent, Journal of the American Helicopter Society, 50(3) (2005) 279-288.
 M.D. Betzina, Tiltrotor descent aerodynamics: A small-scale experimental investigation of Vortex Ring State, in: American Helicopter Society 57th Annual Forum, Washington, DC, 2001.
 M.J. Bhagwat, J.G. Leishman, Stability analysis of helicopter rotor wakes in axial flight, Journal of the American Helicopter Society, 45(3) (2000) 165-178.
 J.R. Spreiter, The rolling up of the trailing vortex sheet and its effect on the downwash behind wings, Journal of the Aeronautical Sciences, 18(1) (1951) 21- 32.
 R. Brown, J. Leishman, S. Newman, F. Perry, Blade twis effects on rotor behaviour in the vortex ring state, (2002).
 A. Azuma, J. Koo, T. Oka, K. Washizu, Experiments on a model helicopter rotor operating in the vortex ringstate, Journal of Aircraft, 3(3) (1966) 225-230.