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Open Mathematics > 2014 > 12 > 7 > 1052-1108
Formalized Mathematics > 2014 > 22 > 1 > 79-84
Discussiones Mathematicae - General Algebra and Applications > 2010 > 30 > 1 > 119-132
Open Mathematics > 2006 > 4 > 3 > 525-530
Discussiones Mathematicae - General Algebra and Applications > 2005 > 25 > 2 > 155-163
Discussiones Mathematicae - General Algebra and Applications > 2004 > 24 > 1 > 75-94
Discussiones Mathematicae - General Algebra and Applications > 2004 > 24 > 1 > 31-42
Discussiones Mathematicae Graph Theory > 2003 > 23 > 1 > 117-127
Discussiones Mathematicae - General Algebra and Applications > 2003 > 23 > 2 > 85-100
Discussiones Mathematicae - General Algebra and Applications > 2002 > 22 > 1 > 39-46
Discussiones Mathematicae - General Algebra and Applications > 2002 > 22 > 1 > 25-31