Gang Wang Yijia Lin Yueyue Song The Vectorization of Engineering Drawings Based on Statistics. 514-517 1996 MVA http://b2.cvl.iis.u-tokyo.ac.jp/mva/proceedings/CommemorativeDVD/1996/papers/1996514.pdf conf/mva/1996 db/conf/mva/mva1996.html#WangLS96