@article{KYB_2007__43_3_a7,
     author = {Ahmane, Mourad and Truffet, Laurent},
     title = {Idempotent versions of {Haar{\textquoteright}s} {Lemma:} links between comparison of discrete event systems with different state spaces and control},
     journal = {Kybernetika},
     pages = {369--391},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {2007},
     mrnumber = {2362725},
     zbl = {1132.93029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_2007__43_3_a7/}
}