1. R. Beyer, Technische Kinematik, Verlag, J. Ambrosius Barth, 1931.
2. L. Burmester, Lehrbuch der Kinematic, Verlag, A. Felix, 1888.
3. Reuther, Bopp, Machine for cutting of oval gears by a hob, Patent No. 668897, 1938.
4. Elliptical gears provide feed control;Boyd;Mach. Des.,1940
5. Tables of Integrals and Other Mathematical Data;Dwight,1961