1. Steel Products—Vocabulary, ISO 6929:2013 (Geneva, Switzerland: International Standards Organization, 2013).
2. B. M. Glasgal, “Bearing Steels 20/20—A Steelmaker's View Point—A Look Back 20 Years and a Look Forward 20 Years,” in Bearing Steels: Into the 21st Century, ed. J. J. C. Hoo and W. B. Green (West Conshohocken, PA: ASTM International, 1998), 189–201, https://doi.org/10.1520/STP12128S
3. H. Scholz, U. Biebricher, H. Franz, A. Paderni, and P. Bettoni, State of the Art in VAR and ESR Processes—A Comparison (Hanau, Germany: ALD Vacuum Technologies, 2014).
4. AQ (Aircraft Quality) Testing Requirements—Understanding What is Meant by Aircraft Quality Steel Cleanliness and How It is Determined;Brada;Gear Solutions,2019
5. Improved M50 Aircraft Bearing Steel through Advanced Vacuum Melting Processes;Schlatter;Journal of Vacuum Science and Technology,1972