1. Cordell, B., Forecasting the next major thrust into space, Space Policy 1996; (Feb)
2. Objectives and role of space development for social challenges in the post cold war era;Yoshida,1996
3. Apel, U., Richarz, H.-P., Zier, M., Potential and efficiency of space activities for solving terrestrial problems. 46th IAF Congress, Oslo, 1995
4. Creola, P., Space and the fate of humanity, Space Policy 1996; (August)
5. Aburdene: Megatrends 2000;Naisbitt,1990