Media type: E-Article Title: Geographic Concentration of Business Services Firms: A Poisson Sorting Model Contributor: Koster, Hans; van Ommeren, Jos; Rietveld, Piet Published: Elsevier BV, 2011 Published in: SSRN Electronic Journal (2011) Language: English DOI: 10.2139/ssrn.1853232 ISSN: 1556-5068 Keywords: Pharmacology (medical) Origination: Footnote: