1. Parallel Hybrid Gas-Electric Geared Turbofan Engine Conceptual Design and Benefits Analysis
2. Fundamentals of Parallel Hybrid Turbofan Mission Analysis with Application to the Electrically Variable Engine
3. 3Bradley, M. K., and Droney, C. K. "Subsonic Ultra Green Aircraft Research Phase I Final Report," National Aeronautics and Space Administration Contractor Report NASA/CR-2011-216847, 2011.
4. 4Bradley, M. K., and Droney, C. K. "Subsonic Ultra Green Aircraft Research Phase II: N+4 Advanced Concept Development," National Aeronautics and Space Administration Contractor Report NASA/CR-2012-217556, 2012.
5. Dynamic Analysis of the hFan, a Parallel Hybrid Electric Turbofan Engine