REFERENCES
- Adams , W. E. and Kerley , R. V. ( 1967 ). The next Decade for Piston Engines , SAE Transactions 76 , 3 , 2232 .
- Stefanides , E. J. ( 1968 ). Ring Installed Near Top of Piston Boosts Power, Cuts Emissions , Designs News 23 , 18 , 25 .
- Wentworth , J. T. ( 1968 ). Piston and Ring Variables Affect Exhaust Hydrocarbon Emissions , SAE Transactions 77 , 1 , 402 .