@misc {IOPORT.70112926,
    author       = {Chikalov, Igor and Moshkov, Mikhail and Zielosko, Beata},
    title        = {Upper bounds on minimum cardinality of exact and approximate reducts},
    howpublished = {RSCTC, 412-417 (2010).},
    year         = {2010},
    doi          = {10.1007/978-3-642-13529-3_44},
    identifier   = {70112926},
}