By Ommeren Jos Van   in Applied Economics Letters

ISSN:1466-4291|5|4|243-246

Routledge Ltd‎(1998)‎

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By Nijkamp Peter   Ommeren Jos Van   in International Journal of Entrepreneurship and Innovation Management

ISSN:1368-275X|6|3|256-264

Inderscience Publishers‎(2006)‎

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