1. Higher harmonics of flapping on the helicopter rotor;Stewart;Aeronautical Research Council CP 121,1952
2. The frequency response of the ordinary rotor blade, the Hiller servo-blade and the Young-Bell stabilizer;Sissingh;Aeronautical Research Council R&M 2860,1950
3. The simple harmonic motion of a helicopter rotor with hinged blades;Zbrozek;Aeronautical Research Council R&M 2813,1949
4. Correspondence in Aircraft Engineering, September and November 1955