@article{ITA_2005__39_3_587_0,
     author = {L\"uttgen, Gerald and Vogler, Walter},
     title = {Bisimulation on speed : lower time bounds},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {587--618},
     publisher = {EDP-Sciences},
     volume = {39},
     number = {3},
     year = {2005},
     doi = {10.1051/ita:2005030},
     mrnumber = {2157048},
     zbl = {1077.68064},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ita:2005030/}
}