Rosen, Aviv; Isser, Aharon (1995). "A Model of the Unsteady Aerodynamics of a Hovering Helicopter Rotor That Includes Variations of the Wake Geometry". Journal of the American Helicopter Society. 40: 6–16. doi:10.4050/JAHS.40.6.
Rosen, Aviv; Isser, Aharon (1995). "A New Model of Rotor Dynamics During Pitch and Roll of a Hovering Helicopter". Journal of the American Helicopter Society. 40: 17–28. doi:10.4050/JAHS.40.17.
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See Amer, K.B. (1950), "Theory of Helicopter Damping in Pitch or Roll and a Comparison with Flight Measurements", NACA TN 2136. Abstract of Amer's articleArchived 2012-03-27 at the Wayback Machine.
See Amer, K.B. (1950), "Theory of Helicopter Damping in Pitch or Roll and a Comparison with Flight Measurements", NACA TN 2136. Abstract of Amer's articleArchived 2012-03-27 at the Wayback Machine.