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University of Arkansas
DOIs: Digital Object Identifiers | University of Arkansas Libraries
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Concordia University Library
DOI - Citing - Library Research Skills Tutorial - Concordia Library
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behance.net
DOI on Behance
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Auburn University
DOI's - APA Citation Style - Subject Guides at Auburn University

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sci-hub.mk
Sci-Hub - How to find the doi number of an article
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sci-hub.mk
Sci-Hub - How to find the doi number of an article
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sci-hub.ee
Sci-Hub - How to find the doi number of an article

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scribbr.com
What is a DOI? | Finding and Using Digital Object Identifiers
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farname.ir
Cross Ref DOI | Farname Inc.
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desarrolloweb.dlsi.ua.es
Research, Development and Innovation: 4 DOI

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