Hirotaka Maeno Tomohiro Iwaki Masato Soga Noriyuki Matsuda Saeko Takagi Hirokazu Taki Fujiichi Yoshimoto Real Time Advice System for Sketch Learning. 795-798 2005 ICCE conf/icce/2005 db/conf/icce/icce2005.html#MaenoISMTTY05