Hiroshi Shimanuki Jien Kato Toyohide Watanabe Constituting Feasible Folding Operation Using Incomplete Crease Information. 68-71 2002 MVA http://b2.cvl.iis.u-tokyo.ac.jp/mva/proceedings/CommemorativeDVD/2002/papers/2002068.pdf conf/mva/2002 db/conf/mva/mva2002.html#ShimanukiKW02