1. Humans to Mars in 1999;Zubrin;Aerospace America,1990
2. Combining near term technologies to achieve a two launch manned Mars mission;Baker,1990
3. Nuclear propulsion—a vital technology for the exploration of Mars and the planets beyond;Borowski,1989
4. Nuclear rockets using indigenous Martian propellants;Zubrin,1989
5. Missions to Mars and the moons of Jupiter and Saturn utilizing nuclear thermal rockets with indigenous propellants;Zubrin,1990