Discussiones Mathematicae - General Algebra and Applications
Discussiones Mathematicae - General Algebra and Applications > 2012 > 32 > 1 > 115-136
Discussiones Mathematicae - General Algebra and Applications > 2012 > 32 > 1 > 23-53
Discussiones Mathematicae - General Algebra and Applications > 2012 > 32 > 1 > 55-76
Discussiones Mathematicae - General Algebra and Applications > 2012 > 32 > 1 > 101-114
Discussiones Mathematicae - General Algebra and Applications > 2012 > 32 > 1 > 77-100