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Köhler, R., Büttgen, M., Faix, A. and Mokros, B., 2002. Importance of marketing in the company. [Cologne: Seminar for General Business Administration, Market Research and Marketing, University of Cologne. Available at: <https://www.researchgate.net/publication/322071682_Bedeutung_des_Marketing_im_Unternehmen_Teilnehmerbericht_uber_eine_empirische_Erhebung>.