Derivation of Willis equation (fundamental equation of planetary gears) - tec-science
Epicyclic Gear Train: Learn its working, parts, and applications
Gear train with sun, planet, and ring gears - MATLAB
HIT for Engineering Brains - Epicyclic gear or planetary gear is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear. Typically,