Dynamic longitudinal stability measurements on a single-rotor helicopter (Hoverfly Mk. 1) /
Stewart, W.,author.
Sissingh, G. J.,author.
Great Britain.Aeronautical Research Committee,issuing body.
Great Britain.His Majesty's Stationery Office.
"February, 1948".
"With appendix on the Theoretical Estimation of the Stability by G. J. Sissingh".