Category:Sjoerd Koopman

**Sjoerd M. J. Koopman**
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Date of birth	1949
Authority file
	Q112438606; ISNI: 0000000120231429; VIAF ID: 29848536; Library of Congress authority ID: no2007053396; Bibliothèque nationale de France ID: 155713994; IdRef ID: 114290121; NL CR AUT ID: js20110415001; PLWABN ID: 9810559328605606; National Library of Israel J9U ID: 987007299745905171
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