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3. Shapochkin, V.I., Zaitseva, I.D., Burenkova, O.S., and Chebotarev, F.M., Contact-Fatigue Strength of Heavy-Duty 20XH3A Steel Gears Hardened by Chemicothermal Treatment, Mekhan. Term. Obrab. Met., 1987, no. 5, pp. 12–15.
4. Yoshida, A., Fujita, K., Kanehara, T., and Ota, K., Effect of Case Depth on Fatigue Strength, Bull. JSME, 1986, no. 247, pp. 228–234.
5. Fujita, K. and Yoshida, A., Influence of the Depth of the Cemented Layer and the Relative Radius of Curvature on the Life in the Contact Fatigue of a Cemented Chromomolybdenum-Steel Roller, Konstr. Tekhnol. Mashinostr., 1981, no. 2, pp. 115–124.