@article {RN155, title = {Improving User Experience for Passenger Information Systems. Prototypes and Reference Objects}, journal = {IEEE Transactions on Professional Communication}, volume = {56}, number = {2}, year = {2013}, pages = {120-137}, doi = {10.1109/TPC.2013.2257211}, url = {http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6524067}, author = {Wirtz, S. and Jakobs, E.-M} }