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References
- 1 2 Prof. dr. Willem Heiser at lumc.nl, 2005. Accessed September 30, 2013
- 1 2 3 4 "Willem Jan Heiser (Willem)" (in Dutch). Leiden University. Archived from the original on 11 October 2020.
- ↑ Willem Heiser at the Mathematics Genealogy Project
- ↑ Prof.dr. Willem Heiser koninklijk onderscheiden at nieuws.leidenuniv.nl, 31-01-2014. Accessed January 31, 2014.
- ↑ List of Publications at National Library of the Netherlands
- ↑ Willem Heiser at DBLP Bibliography Server
