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Differential Geometry and its Applications > 2014 > 32 > Complete > 130-138
Annals of Global Analysis and Geometry > 1998 > 16 > 1 > 89-100
Differential Geometry and its Applications > 2014 > 32 > Complete > 130-138
Annals of Global Analysis and Geometry > 1998 > 16 > 1 > 89-100