References

1. http://www.space-tourism.ws/index.html

2. http://edition.cnn.com/2007/TECH/space/09/27/euro.space.tourism/index.html

3. http://www.rocketplaneglobal.com/index.html

4. http://www.spacefleet.org.uk/project/sf-01.htm

5. http://www.xcor.com

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