@article{Wiesner, author = {Wiesner, Knut}, title = {Erfolg f{\"u}r Citycards?}, series = {Direkt Marketing}, journal = {Direkt Marketing}, number = {10}, address = {Ettlingen}, pages = {44}, language = {de} } @article{Wiesner, author = {Wiesner, Knut}, title = {Welche Chancen bietet der E-Commerce im Außenhandel?}, series = {Direkt Marketing}, journal = {Direkt Marketing}, number = {09}, address = {Ettlingen}, pages = {52 -- ff.}, language = {de} } @article{Wiesner, author = {Wiesner, Knut}, title = {Kundenkarten-Boom in 2001?}, series = {Direkt Marketing}, journal = {Direkt Marketing}, number = {6}, address = {Ettlingen}, pages = {34 -- ff.}, language = {de} }