. "Stability of helicopters" . "H\u00E9licopt\u00E8res -- Conception et construction" . . . . . "Helicopter operational loads spectrum and design criteria" . "Helicopter operational loads spectrum and design criteria" . . "Text" . "H\u00E9licopt\u00E8res -- Stabilit\u00E9" . . . . "1974" . . "Helicopters -- Design and construction" .