Table 2. 

DOI counts in the six sources for the year 2019. The last column shows the numbers of documents without DOIs in the Article category alone.

Query France 2019Number of documentsDocuments with DOI% DOICategory: Articles with no DOI
Scopus 123,181 115,273 94 1,709 
WoS 124,790 101,377 85 2,763 
HAL 158,937 66,836 42 16,992 
ADS 19,997 15,731 79 56 
PubMed 56,038 55,516 99 522 
MAG   101,885 – – 
Query France 2019Number of documentsDocuments with DOI% DOICategory: Articles with no DOI
Scopus 123,181 115,273 94 1,709 
WoS 124,790 101,377 85 2,763 
HAL 158,937 66,836 42 16,992 
ADS 19,997 15,731 79 56 
PubMed 56,038 55,516 99 522 
MAG   101,885 – – 
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