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Open Mathematics > 2017 > 15 > 1 > 126-150
Discussiones Mathematicae - General Algebra and Applications > 2013 > 33 > 1 > 109-115
Open Mathematics > 2012 > 10 > 1 > 329-351
International Journal of Applied Mathematics and Computer Science > 2001 > 11 > 6 > 1285-1310