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Mediterranean Journal of Mathematics > 2012 > 9 > 2 > 357-378
Mathematical Notes > 2006 > 79 > 5 > 841-847
Mathematical Notes > 2006 > 79 > 5-6 > 841-847
Applied Categorical Structures > 2000 > 8 > 1-2 > 115-144
Mediterranean Journal of Mathematics > 2012 > 9 > 2 > 357-378
Mathematical Notes > 2006 > 79 > 5 > 841-847
Mathematical Notes > 2006 > 79 > 5-6 > 841-847
Applied Categorical Structures > 2000 > 8 > 1-2 > 115-144