@article{CC_2009_38_2_a5,
     author = {Lietard, Ludovic and Rocacher, Daniel},
     title = {Conditions with aggregates evaluated using gradual numbers},
     journal = {Control and Cybernetics},
     pages = {395--417},
     year = {2009},
     volume = {38},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2009_38_2_a5/}
}