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International Journal of Theoretical Physics > 2017 > 56 > 12 > 3895-3911
Studia Logica > 2016 > 104 > 6 > 1145-1177
Mathematica Slovaca > 2012 > 62 > 6 > 1091-1104
Mathematica Slovaca > 2011 > 61 > 2 > 155-172
International Journal of Theoretical Physics > 2009 > 48 > 5 > 1320-1333