3Ramo' n Rubio Garcl' a^*, Javier Sua' fez Quiro' s. Interactive multimedia animation with Macromedia Flash in Descriptive Geometry teaching [J]. Computers & Education, 2007, (49) :615 - 639
4Kuo- En Chang, Yao- Ting Sung, Shui- Feng Lin, Computerassisted learning for mathematical problem solving[ J]. Computers & Education, 2006, (46) : 140 - 151