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Bulletin of the Section of Logic > 2021 > 50 > 3 > 289-298
Demonstratio Mathematica > 2016 > Vol. 49, nr 3 > 252--256
Semigroup Forum > 2012 > 85 > 3 > 477-512
Studia Logica > 2012 > 100 > 1-2 > 319-338
Journal of Algebra > 2011 > 334 > 1 > 1-30
Reports on Mathematical Logic > 2011 > 46 > 3-15
Semigroup Forum > 2010 > 80 > 2 > 341-345
Algebra universalis > 2008 > 59 > 3-4 > 405-428
Acta Applicandae Mathematicae > 2005 > 85 > 1-3 > 313-318
Discussiones Mathematicae - General Algebra and Applications > 2004 > 24 > 2 > 267-275
Discussiones Mathematicae - General Algebra and Applications > 2001 > 21 > 2 > 255-268
Reports on Mathematical Logic > 2000 > No. 34 > 79-106