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Acta Mathematica Hungarica > 2018 > 154 > 2 > 279-288
Algebra universalis > 2017 > 78 > 1 > 55-65
Studia Logica > 2015 > 103 > 4 > 713-731
Studia Logica > 2014 > 102 > 1 > 29-39
Acta Mathematica Hungarica > 2013 > 140 > 1-2 > 1-11