PHAIDRA is using following free services:

Crosscite - The DOI Citation Formatter | Crossref, mEDRA, ISTIC, JaLC
DANTE - Datendrehscheibe für Normdaten und Terminologien - Verbundzentrale (VZG), Gemeinsamen Bibliotheksverbundes (GBV)
GeoNames - The GeoNames geographical database
ROR - Research Organization Registry
Sherpa Services - Tools to access and comply with OA archiving policies | Jisc
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