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Mathematical Notes > 2018 > 104 > 1-2 > 316-318
Open Mathematics > 2015 > 13 > 1
Topology and its Applications > 2014 > 161 > Complete > 37-57
Topology and its Applications > 2011 > 158 > 15 > 1962-1968
Topology and its Applications > 2004 > 137 > 1-3 > 51-57