• TIB, German National Library for Science and Technology
• CVTI-SR, Slovak Centre of Scientific and Technical Information • J-STAGE, Largest Collection of e-Journals in Japan • INIS, International Nuclear Information System • KISTI, Korea Institute of Science and Technology Information • Inist-CNRS, Scientific and Technical Document Delivery • New York Academy of Medicine - Urban Health Uncovered • IAEA, International Atomic Energy Agency • TGJ, An International Journal on Grey Literature • De Gruyter|Saur, Grey Literature in Library and Information Studies • EBSCO, LISTA-FT • NTK. National Technical Library, Prague • IIA, Information Internatiional Associates