1. HyPlane: challenges for space tourism and business transportation;Savino;J. Aeronaut. Aero. Eng.,2013
2. Suborbital Reusable Vehicles: A 10-Year Forecast of Market Demand,2015
3. Astrium suborbital spaceplane project - demand analysis of suborbital space tourism;Le Goff;Acta Astronaut.,2013
4. FAA Aerospace Forecast,2013