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- [6] UNITED-STATES URGED TO NEGOTIATE TREATY BASED UPON FREEDOM OF SPACE AVIATION WEEK & SPACE TECHNOLOGY, 1984, 120 (22): : 118 - 118
- [8] THE UNITED-STATES PROGRAMME IN SPACE RESEARCH PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1959, 253 (1275): : 538 - 541