Discussiones Mathematicae - General Algebra and Applications
Discussiones Mathematicae - General Algebra and Applications > 2006 > 26 > 1 > 45-73
Discussiones Mathematicae - General Algebra and Applications > 2010 > 30 > 2 > 147-171
Discussiones Mathematicae - General Algebra and Applications > 2006 > 26 > 1 > 45-73
Discussiones Mathematicae - General Algebra and Applications > 2010 > 30 > 2 > 147-171