1. Abell, P.A., Barbee, B.W., Mink, R.G., Adamo, D.R., Alberding, C.M., Mazanek, D.D., et al.: The Near-Earth Object Human Space Flight Accessible Targets Study (NHATS) List of Near-Earth Asteroids: Identifying Potential Targets For Future Exploration. NASA (2012)
2. Adamo, D.R., Giorgini, J.D., Abell, P.A., Landis, R.R.: Asteroid Destinations Accessible for Human Exploration: A Preliminary Survey in Mid-2009. Journal of Spacecraft and Rockets 47(6), 994–1002 (2010)
3. Alessi, E.M.: The Role and Usage of Libration Point Orbits in the Earth - Moon System [PhD Thesis], Universitat de Barcelona, Barcelona (2010)
4. Aravind, P.K.: The physics of the space elevator. American Journal of Physics 75(2), 125–130 (2007)
5. Baoyin, H.-X., Chen, Y., Li, J.-F.: Capturing near earth objects. Research in Astronomy and Astrophysics 10(6), 587–598 (2010)