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Dietmar Harhoff, Are There Financing Constraints for R&D and Investment in German Manufacturing Firms?, Annales d'Économie et de Statistique, No. 49/50, Économie et Économétrie de l'innovation / The Economics and Econometrics of Innovation (Jan. - Jun., 1998), pp. 421-456
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Harhoff (1998) studied this question.
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