Journal Indexing

1- Chemical Abstracts Service  CAS databases
2- BASE search engine  *BASE Bielefeld Academic Search Engine
3- Google 

4- Hamburg journals 

5- Semantic Scholar 
6- Geneva Foundation For Medical education and research
7-ICMJE International Committee of Medical Journal Editors
8- DOI 
9- Crossref
10- Electronic  Journals Library Universitätsbibliothek Bayreuth
11- ResearchGate
12- EuroPub
13- University of Chicago Library
14- Internet Archive
15-Worldcat
16- ExLibris
17.Directory of Research Journals Indexing
18.The German Union Catalogue of Serials (ZDB)
19.  Open Ukrainian Scientific Citation Index OUCI
20. EZB electronic Journals Library( Germany)
21. Keio University
22.  Index Medicus for the Eastern Mediterranean Region (IMEMR)
23. Scite.ai
24. OpenAlex
25. Helinet
26. openaire
27.      Electronic website
28. German Union Catalogue of Serials (ZDB)
29. Scilit
30. J Gate
31. WikiDATA