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Demonstratio Mathematica > 2015 > Vol. 48, nr 4 > 546--553
Physica D: Nonlinear Phenomena > 2009 > 238 > 19 > 2016-2023
Graphs and Combinatorics > 2002 > 18 > 3 > 533-564
Linear Algebra and Its Applications > 2000 > 321 > 1-3 > 239-280
Fuzzy Sets and Systems > 1999 > 104 > 1 > 61-75