References
- Yakubovskii , V V . 1986 . Probl Prochn , : 50 – 55 . (7)
- Drozd , M S . 1972 . Khim Neft Mashinostr , : 24 – 25 . (5)
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- Gudkov , A A and Slavskii , Yu I . 1982 . ‘Methods of measuring hardness of metals and alloys’ , Moscow : Publ Metallurgiya .