@article{Kretz2008a, author = {Kretz, T. and Gr\"unebohm, A. and Kessel, A. and Kl\"upfel, H. and Meyer-K\"onig, T. and Schreckenberg, M.}, title = "{Upstairs Walking Speed Distributions on a Long Stairway}", journal = {Safety Science}, volume = {46}, issue = {1}, year = {2008}, doi = {10.1016/j.ssci.2006.10.001} }