By Stephan Paula   Gurmu Shiferaw   Sumell Albert   Black Grant   in Economics of Innovation and New Technology

ISSN:1043-8599|16|2|71-99

Routledge Ltd‎(2007)‎

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By Maguire Kelly B.   Taylor Laura O.   Gurmu Shiferaw   in Applied Economics Letters

ISSN:1466-4291|10|12|753-756

Routledge Ltd‎(2003)‎

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