Takashi Terashima Hiroshi Shimanuki Jien Kato Toyohide Watanabe Method for Representing 3-D Virtual Origami. 1211-1215 2005 conf/icdar/2005 ICDAR http://doi.ieeecomputersociety.org/10.1109/ICDAR.2005.159 db/conf/icdar/icdar2005.html#TerashimaSKW05