Yoichi Takeshita Mutsuhiro Terauchi Kenji Onaga A Method for Tumor Shape Extraction from X-Ray Mammography. 133-136 1992 MVA http://b2.cvl.iis.u-tokyo.ac.jp/mva/proceedings/CommemorativeDVD/1992/papers/1992133.pdf conf/mva/1992 db/conf/mva/mva1992.html#TakeshitaTO92