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Topology and its Applications > 2009 > 156 > 7 > 1192-1198
Journal of Mathematical Analysis and Applications > 2007 > 334 > 1 > 646-655
Topology and its Applications > 2007 > 154 > 10 > 2185-2195
Journal of Mathematical Analysis and Applications > 2006 > 314 > 2 > 537-545
Mathematical Notes > 2005 > 78 > 3-4 > 597-599