Fast Free Returns to Mars and Venus with Applications to Inspiration Mars Hughes, Kyle M. ; Edelman, Peter J. ; Saikia, Sarag J. ; Longuski, James M. ; Loucks, Michel E. ; Carrico, John P., Jr. ; Tito, Dennis A. Abstract Publication: Journal of Spacecraft and Rockets Pub Date: November 2015 DOI: 10.2514/1.A33293 Bibcode: 2015JSpRo..52.1712H