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Dolfsma, W.A. (2008). Book review [Book review HipHop, musik und die artikulation von geographie]. Erdkunde, 62(3), 275-277.
Dolfsma, W.A., & Leydesdorff, L. (2008). 'Medium-tech' may be of greater importance to a local economy than 'high-tech' firms: New methods for measuring the knowledge base of an economic system. Medical Hypotheses, 71, 330-334.