1. Lewis, W.
, 1893, “Investigation of the Strength of Gear Teeth,” Proc. Engr’s Club Phila., 10, pp. 16–23.
2. Niemann, G., 1978, Machine Element Design and Calculation in Mechanical Engineering, Vol. II, Gears, Translated by K. Lakshminarayana et al., Springer-Verlag Berlin Heidelberg, New York.
3. DIN 3990, 1972, Calculation of Load Capacity of Spur, Helical and Bevel Gears, Deutsche Norm., Berlin.
4. Dolan, T. J., and Broghamer, E. L., 1942, “A Photoelastic Study of the Stresses in Gear Tooth Fillet,” University of Illinois Bull. 335.
5. Allison, I. M., and Hearn, E. J., 1980, “A New Look at the Bending Strength of Gear Teeth,” Exp. Mech., pp. 217–226.