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1·Grey literature is a kind of important and valuable information recourse.

灰色文献是一种具有重要情报价值的信息源。

2·The most common types of grey literature were abstracts (55%) and unpublished data (30%).

灰色文献最常见的型式为摘要(55%)及未出版的资料(30%)。

3·To review systematically research studies, which have investigated the impact of grey literature in meta-analyses of randomized trials of health care interventions.

凡探索灰色文献对随机临床试验统合分析结果之影响的相关研究，收集并进行系统性的回顾。

4·The paper describes the concept and characteristics of the grey literature resources on the Internet and introduces the way of collecting and utilizing the grey literature available.

阐述了在网络环境下灰色文献的含义和特点，以及如何对其进行有效收集利用。