← Search Research Policy 2009 Accounting for change in national systems of innovation: A friendly critique based on the U.S. case David M. Hart George Mason University DOI10.1016/j.respol.2009.01.015 Sources semanticscholar openalex Cite APA 7 MLA 9 Chicago (author–date) Harvard Elsevier Harvard (JFE, JBF…) The Accounting Review Academy of Management American Marketing Association INFORMS (Management Science) Copy citation Copied ✓