1. T.F. Chen: Product Data Exchange Technology Based on STEP and XML. Machinery Design&Manufacture. Vol. 12 (2009), pp.214-215.
2. X.L. Qiu, X. Xu and Z.H. Ni: Digital Product Information Sharing Based on STEP and XML. The 9th International Conference for Young Computer Scientists. (2008), pp.708-713.
3. C.Y. Wang, Q.K. Liu, F.L. Hu and C.L. Hu: Research on Data Sharing in Mould Collaborative Design Alliance Based on Web3D/STEP. China Mechanicl Engineering. Vol. 17 (2006), pp.2477-2481.
4. W. Liu, Q.L. Zeng and W.H. Fan: Research on the WEB-based Product Data Exchange Technology. Machine Tool & Hydraulics. Vol. 17 (2008), pp.232-235.
5. GB/T 16656. 11-1996 Part 21: Descriptive methods: the EXPRESS Language Reference Manual (Standards Press Of China, China 1996).