grey literature meaning in English

灰色文献〔指散发给公众的各种产品信息，使用手册等非正式出版物〕。

The development and utilization of the grey literature in university library
高校图书馆灰色文献开发利用初探
The development and utilization of the library ' s grey literature and the library - based resources
图书馆灰色文献与馆本资源的开发利用
The article mainly explores collection of grey literature among america , japan and europe , and proposes some collects the enlightenment of grey documents to our country
摘要本文通过对美国、日本、欧洲灰色文献的收集的介绍，并提出了一些对我国收集灰色文献的启示。
On the basis of analyzing type , charater and yntelligeue of grey literature , discuss about the collution of grey literature and the use methods on network though work practice
摘要在分析灰色文献的种类、特点及情报价值的基础上，通过工作实践探讨了灰色文献的搜集及灰色文献网利用。
The paper analyzes the superiority of grey literature on the internet , introduces the study status of grey literature on internet , then points out some problems in the work of grey literature on the internet , and elicitation for the work of grey literature on the internet of our country
摘要本文分析了网上灰色文献所具有的优势，介绍了当前网上灰色文献的研究状况，然后指出了目前网上灰色文献工作中存在的问题，及对我国网上灰色文献工作的启发。