@article{CMUC_1990__31_4_a16,
     author = {Aarts, Jan M. and van Maaren, H.},
     title = {Preference numbers and funnel dimension},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {769--774},
     publisher = {mathdoc},
     volume = {31},
     number = {4},
     year = {1990},
     mrnumber = {1091374},
     zbl = {0725.54028},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1990__31_4_a16/}
}