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The economics of technological change , The economics of technological change , کتابخانه دیجیتال و فن آوری اطلاعات دانشگاه امام صادق(ع)
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Newbery et al. (Sat,) studied this question.
www.synapsesocial.com/papers/6a10cfd249545a83bbee6c73 — DOI: https://doi.org/10.2307/2551983
David Newbery
Elaine Mansfield
Economica
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