@book{KillePflaumWilhelmetal., author = {Kille, Christian and Pflaum, A. and Wilhelm, M. and Prockl, G.}, title = {Consumer Direct}, language = {de} } @book{KilleProcklPflaumetal., author = {Kille, Christian and Prockl, G. and Pflaum, A. and Wilhelm, M.}, title = {Consumer Direct Logistics}, editor = {Europe, ECR-}, address = {Br{\"u}ssel}, language = {en} }