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2. Engine valve seat and insert wear;Van Dissel;SAE Paper no. 892146,1989
3. Wear mechanisms of valve seat and insert in heavy duty diesel engines;Wang;SAE Paper no. 952476,1995
4. Investigation of the mechanism of exhaust valve seat wear in engines run on unleaded gasoline;Godfrey;SAE Paper no. 710356,1971
5. Hot corrosion of diesel engine exhaust valves;Chaudhuri;SAE Paper no. 710356,1973