@article {Kretz2011g,
   author = {Kretz, T.},
   title = {A level of service scheme for microscopic simulation of pedestrians that integrates queuing, uni-and multi-directional flow situations},
   journal = {European Transport Research Review},
   pages = {211-220},
   volume = {3},
   issue = {4},
   doi = {10.1007/s12544-011-0060-7},
   year = {2011}
}