Papers in Regional ScienceVolume 80, Issue 3 p. 249-253 Knowledge spill-overs, innovation and regional development Henri L.F. de Groot, Henri L.F. de Groot Department of Spatial Economics, Free University, De Boelelaan 1105, 1081 HV Amsterdam, The Netherlands, (e-mail: 1hgroot@econ.vu.nl; pnijkamp@econ.vu.nl)Search for more papers by this authorPeter Nijkamp, Peter Nijkamp Department of Spatial Economics, Free University, De Boelelaan 1105, 1081 HV Amsterdam, The Netherlands, (e-mail: 1hgroot@econ.vu.nl; pnijkamp@econ.vu.nl)Search for more papers by this authorZoltan Acs, Zoltan Acs Merrick School of Business, University of Baltimore, Baltimore, MD 21201-5779, USA (e-mail: zacs@ubmail.ubalt.edu)Search for more papers by this author Henri L.F. de Groot, Henri L.F. de Groot Department of Spatial Economics, Free University, De Boelelaan 1105, 1081 HV Amsterdam, The Netherlands, (e-mail: 1hgroot@econ.vu.nl; pnijkamp@econ.vu.nl)Search for more papers by this authorPeter Nijkamp, Peter Nijkamp Department of Spatial Economics, Free University, De Boelelaan 1105, 1081 HV Amsterdam, The Netherlands, (e-mail: 1hgroot@econ.vu.nl; pnijkamp@econ.vu.nl)Search for more papers by this authorZoltan Acs, Zoltan Acs Merrick School of Business, University of Baltimore, Baltimore, MD 21201-5779, USA (e-mail: zacs@ubmail.ubalt.edu)Search for more papers by this author First published: 14 January 2005 https://doi.org/10.1111/j.1435-5597.2001.tb01798.xCitations: 4AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume80, Issue3July 2001Pages 249-253 RelatedInformation