Discussiones Mathematicae - General Algebra and Applications
Discussiones Mathematicae - General Algebra and Applications > 2002 > 22 > 1 > 39-46
Discussiones Mathematicae - General Algebra and Applications > 2002 > 22 > 1 > 25-31
Discussiones Mathematicae - General Algebra and Applications > 2003 > 23 > 2 > 85-100
Discussiones Mathematicae - General Algebra and Applications > 2004 > 24 > 1 > 75-94
Discussiones Mathematicae - General Algebra and Applications > 2004 > 24 > 1 > 31-42
Discussiones Mathematicae - General Algebra and Applications > 2005 > 25 > 2 > 155-163
Discussiones Mathematicae - General Algebra and Applications > 2010 > 30 > 1 > 119-132