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2. Dudas, I.: The Theory and Practice of Worm Gear Drives. Penton Press, London (2000)
3. Litvin, F.L., et al.: Gear Geometry and Applied Theory, 2nd edn. Cambridge University Press, Cambridge (2004)
4. Crosher, W.: Design and Application of the Worm Gear. ASME Press, New York (2002)
5. Litvin, F.L.: Meshing Principle for Gear Drives (齿轮啮合理论) (trans. D Chun). Shanghai Science and Technology Press, Shanghai (1964). (in Chinese)