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WikiPedia: Ernst_Ahl http://data.bibliotheken.nl/id/thes/p131320149 https://id.loc.gov/authorities/names/no2002069342 https://d-nb.info/gnd/1055417605 https://isni.org/isni/0000000084804495 https://viaf.org/viaf/117717512 https://www.wikidata.org/wiki/Q62777#identifiers https://www.worldcat.org/identities/lccn-no2002069...