二次文献 meaning in Chinese

secondary publications
secondary source

On better utilization of the second class document
对提高二次文献利用率的探讨
Secondary literature exploiture of private college library
浅论民办高校图书馆二次文献开发
Services for agriculture , countryside and farmer and work on secondary documents
服务与二次文献工作
In this paper , the architecture , main components and the design idea of an automatic generating system of chinese second documents are introduced
开发了中文二次文献自动生成系统，介绍了该系统的体系结构、主要构成、设计思想及其基本原理。