لوتز كوفمان (Lutz Kaufmann): أستاذ المفاوضات التجارية والمشتريات الداخلية في كلية دبليو آتش يو أوتو بايزهايم للإدارة (WHU – Otto Beisheim School of Management) في دوسلدورف بألمانيا.
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