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As university-industry cooperation is associated with the transfer of knowledge and technology, this collaboration is an extremely important field of study for the world's economies that helps companies become more competitive. The present research, thus, sought to explore and analyse the literature related to university-industry cooperation, using a co-citation analysis. This study's objectives were to (1) identify the main co-cited references and the groups (i.e. clusters) they form and (2) discuss the challenges this literature presented in the study of university-industry cooperation. The articles reviewed were obtained with a search of the ISI's Web of Science and were submitted to a bibliometric analysis using VOSviewer software. This systematic literature review revealed that companies are increasingly focused on cooperation with universities. The results include four clusters, namely, (1) Absorption Capacity, Knowledge and Competitiveness in University-Industry Relations, (2) Impact of Knowledge Spill-overs on University-Industry Relations, (3) Strategic Alliances for Industry Innovation, and (4) University-Industry Cooperation. This study thus contributes to a greater and more detailed understanding of the production flow, scientific practices, and trends in this new and stimulating field of research.

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We examine how optimism predicts creativity both directly and through the mediating role of positive affect and the positivity ratio (the ratio between the frequency of positive and negative affective states). Five hundred and ninety five employees reported their positive and negative affect, as well as their optimism. Their creativity was reported by supervisors. The main findings are the following: (1) optimism predicts creativity both directly and through the mediating role of positive affect and the positivity ratio; (2) the relationship between the positivity ratio and creativity is curvilinear, in such a way that an ''excessive'' ratio is detrimental to creativity. The findings stress the relevance of optimism both for individuals and organizations, and suggest that examining positivity ratios is fruitful in the creativity domain, as it has been in other domains, and that negative affect should not be viewed simply as an obstacle when studying employees' creativity. We are grateful to Fred Luthans, Carolin Youssef, and Bruce Avolio for their permission to use the PsyCap questionnaire, from which the items for measuring optimism were extracted.