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Is there a doi in the general conference collection?
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Not all published papers have doi numbers. Many papers published in domestic provincial journals do not have this doi number. Generally, those with this number are better journals.

DOI is a common code for international journals, which is equivalent to giving each article an ID number. Articles not included in EI can also be included. Moreover, DOI is also applied for voluntarily, and many journals don't use it, and their articles don't have DOI numbers.