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Lettera Matematica > 2013 > 1 > 3 > 137-144
Foundations of Science > 2008 > 13 > 2 > 149-161
Nexus Network Journal > 2006 > 8 > 1 > 93-106
Lettera Matematica > 2013 > 1 > 3 > 137-144
Foundations of Science > 2008 > 13 > 2 > 149-161
Nexus Network Journal > 2006 > 8 > 1 > 93-106