Crossref

Polska Bibliografia Naukowa

ROAD - Directory of Open Access Scholarly Resources

National Library of Ukraine named after V. I. Vernadskyi

UCSB Library

Dimensions

fatcat!

German Union Catalogue of Serials

Keepers Registry

Système universitaire de documentation

Sherpa Romeo

OpenAlex

Wikidata

University of Oslo Library

University of Hull Library

SOLO - Search Oxford Libraries Online

European University Institute

Leipzig University Library

Cambridge University Library

Litmaps

ACSE

Open Ukrainian Citation Index

Worldcat

CORE