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Eryigit C, Eryigit M. THE EFFECT OF SPONSORSHIP ANNOUNCEMENTS ON STOCK RETURNS: DOES INDUSTRY CONCENTRATION MATTER?. pijss [Internet]. 2017 Dec. 1 [cited 2025 Jul. 2];3(3):239-51. Available from: https://mail.grdspublishing.org/index.php/people/article/view/645