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Journal of Contemporary Mathematical Analysis (Armenian Academy of Sciences) > 2017 > 52 > 6 > 295-304
Czechoslovak Mathematical Journal > 2015 > 65 > 3 > 801-817
Journal of Mathematical Analysis and Applications > 2013 > 404 > 1 > 64-70
Journal of Mathematical Analysis and Applications > 2009 > 357 > 1 > 15-24
Applied Categorical Structures > 2006 > 14 > 2 > 123-134
Discrete Mathematics > 2001 > 229 > 1-3 > 235-259