Balzer, Detlev, et al. “The Project ‘GND for Cultural Data’ (GND4C)”. O-Bib. Das Offene Bibliotheksjournal Herausgeber VDB, vol. 6, no. 4, Dec. 2019, pp. 59-97, https://doi.org/10.5282/o-bib/2019H4S59-97.