Internal and External R&D: A Sample Selection Approach*
نویسندگان
چکیده
منابع مشابه
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ژورنال
عنوان ژورنال: Oxford Bulletin of Economics and Statistics
سال: 2004
ISSN: 0305-9049,1468-0084
DOI: 10.1111/j.1468-0084.2004.00089.x