Nabours, Stephen; Shkolnik, Alexander; Shkolnik, Nikolay; Nelms, Ryan; Gnanam, Gnanaprakash (April 2010). 2010 SAE World Congress: High Efficiency Hybrid Cycle Engine. Society of Automotive Engineers, World Congress. Detroit, MI, US. Paper 2010-01-1110. Archived from the original on February 29, 2012.
Nabours, Stephen; Shkolnik, Alexander; Shkolnik, Nikolay; Nelms, Ryan; Gnanam, Gnanaprakash (April 2010). 2010 SAE World Congress: High Efficiency Hybrid Cycle Engine. Society of Automotive Engineers, World Congress. Detroit, MI, US. Paper 2010-01-1110. Archived from the original on February 29, 2012.