@article{CC_2006_35_2_a12,
     author = {Niewiadomski, A. and Ochelska, J. and Szczepaniak, P. S.},
     title = {Interval-valued linguistic summaries of databases},
     journal = {Control and Cybernetics},
     pages = {415--443},
     publisher = {mathdoc},
     volume = {35},
     number = {2},
     year = {2006},
     zbl = {1190.68023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2006_35_2_a12/}
}