@unpublished{WiertzWaltherZoettl, author = {Wiertz, Ann-Kathrin and Walther, Andrea and Z{\"o}ttl, Gregor}, title = {Strategic Retailers in the Energy Sector}, url = {https://opus4.kobv.de/opus4-trr154/561}, language = {en}, type = {Preprint}, institution = {TRR 154} }