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DOI ( Digital Object Identifier ) Reference

Digital Object Identifier (DOI) is a digital resource recognition system. Resources include videos, reports, books or other digital resources. It is the only online identifier. DOI can be switched to permanent site, so that the researcher can identify and get the needed passage quickly.

DOI currently has 8 main proxy machanisms:
Airiti Library(Taiwan)
CrossRef(United States)(The world's largest proxy machanism only provides academic information) Query Description
Entertainment Identifier Registry EIDR (United States)
R.R. Bowker(United States)
DataCite (Germany)
Medra (Europe)  
OPOCE (Office des publications EU) (EU)
中國科技出版傳媒有限公司科學出版社(China)
Japan Link Center(Japan)