Discussiones Mathematicae - General Algebra and Applications
Discussiones Mathematicae - General Algebra and Applications > 2000 > 20 > 2 > 255-265
Discussiones Mathematicae - General Algebra and Applications > 2001 > 21 > 2 > 207-218
Discussiones Mathematicae - General Algebra and Applications > 2000 > 20 > 2 > 255-265
Discussiones Mathematicae - General Algebra and Applications > 2001 > 21 > 2 > 207-218