1. An integrated economic evaluation of preliminary aero-engine design concepts;Kappler,2013
2. Subsonic Fixed Wing Project Overview of Technical Challenges for Energy Efficient, Environmentally Compatible Subsonic Transport Aircraft;Del Rosario,2012
3. N+3 Technologies and Concepts, Green Aviation Summit;Wahls,2010
4. Review of Propulsion Technologies for N+3 Subsonic Vehicle Concepts;Ashcraft,2011
5. R. Wahls, R. Del Rosario, G. Follen, Overview of the NASA N+3 Advanced Transport Aircraft Concept Studies, 2nd UTIAS-MITACS, International Workshop on Aviation and Climate Change, NASA, 2010.