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by Kotler, Philip; Berger, Roland; Bickhoff, Nils
by Bickhoff, Nils; Hollensen, Svend; Opresnik, Marc Oliver
by Philip Kotler; Roland Berger; Nils Bickhoff
by Bickhoff, Nils
by Caspers, Rolf; Bickhoff, Nils; Bieger, Thomas
by Bieger, Thomas; Bickhoff, Nils; Caspers, Rolf; et al.
