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Problemy Eksploatacji > 2011 > nr 2 > 181-188
Applied Computer Science > 2010 > Vol. 6, no 2 > 7--18
Management > 2009 > Vol. 13, no 1 > 270-282
Journal of Medical Systems > 2008 > 32 > 1 > 65-83
Management > 2008 > Vol. 12, no 1 > 295-305
Fuzzy Sets and Systems > 2004 > 146 > 3 > 375-401