8Shigeo Hiraro, Kenjiro Suzuki. Design and drawing/CAD education expected by companies [A].In: Proceedings of the 4^th JCJCGE Supplement [C].1999. 1-9.
9Kenjiro Suzuki. Is descriptive geometry behind thetime [A]. In: Proceedings of the 5^th JCJCGE [C].2001. 313-317.
10Zhang Yunfei. A computer aided solution for descriptive geometry [A]. In: Proceeding of the 11^th ICGG[C]. 2004. 379-384.