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2. Safety Assurance for Environmental Introductions of Geneticall Engineered Organisms, NATO ASI Series,1988
3. Report of the Third Meeting of the Working Group, 1987, UNIDO/WHO/UNEP Working Group on Biotechnology Safety
4. Introduction of Recombinant DNA-Engineered Organisms into the Environment: Key Issues,1987
5. Field Testing Genetically Modified Organisms: Framework for Decisions,1989