Shou Kumokawa Kazuko Takahashi Drawing a Figure in a Two-Dimensional Plane for a Qualitative Representation. 337-353 2007 conf/cosit/2007 COSIT http://dx.doi.org/10.1007/978-3-540-74788-8_21 db/conf/cosit/cosit2007.html#KumokawaT07