1. NASA's Dryden experience in parameter estimation and its uses in flight test;Iliff,1982
2. Stability and Control of Airplane and Helicopters;Seckel,1964
3. Helicopter theory;Wayme,1980
4. Analysis and Design of Space Vehicle Flight Control System;Greensite,1970
5. Optimal nonlinear feedback for spacecraft altitude maneuvers;Carrington,1983