Differential Geometry and its Applications
Differential Geometry and its Applications > 2002 > 16 > 2 > 133-140
Differential Geometry and its Applications > 2002 > 17 > 1 > 15-35
Differential Geometry and its Applications > 2002 > 16 > 2 > 133-140
Differential Geometry and its Applications > 2002 > 17 > 1 > 15-35