@article{ARM_2003__39_1_a3,
     author = {\v{Z}\'ak, Libor},
     title = {Clustering of vaguely defined objects},
     journal = {Archivum mathematicum},
     pages = {37--50},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {2003},
     mrnumber = {1982210},
     zbl = {1122.62319},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2003__39_1_a3/}
}