1. Epicyclic gearing;Wilson,1931
2. Steplessly adjustable or variable-ratio drives;Davies;Chart. Mech. Engr.,1965
3. BROWN W., Epicyclic Gearing: Kinematic and Torque Distribution, chapter 6. The Machinery Publishing Co. Ltd., London.
4. Epicyclic gear systems;Laughlin;Machine Design,1956
5. Power flow and loss in differential mechanisms;Macmillan;J. Mech. Engng Sci.,1961