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- [3] ENVIRONMENTAL-LAW ASPECTS OF MAINTAINING OUTER SPACE FOR PEACEFUL PURPOSES PROCEEDINGS OF THE THIRTY-FIRST COLLOQUIUM ON THE LAW OF OUTER SPACE, 1989, : 61 - 69
- [4] SPACE COMMERCE IN THE CONTEXT OF MILITARY POWER - MAINTAINING OUTER-SPACE FOR PEACEFUL PURPOSES PROCEEDINGS OF THE THIRTY-THIRD COLLOQUIUM ON THE LAW OF OUTER SPACE, 1991, : 62 - 67