Guy Froimovich Ehud Rivlin Ilan Shimshoni Object Classification by Functional Parts. 648-655 2002 conf/3dpvt/2002 3DPVT http://csdl.computer.org/comp/proceedings/3dpvt/2002/1521/00/15210648abs.htm db/conf/3dpvt/3dpvt2002.html#FroimovichRS02