8Pomerantz I, Saba K, et al. Three dimensional modeling apparatus: US,5386500 [ P]. 1995, http://www. google. com/patent.
9Efrem V. Fudim. Method and apparatus for production for three- dimensional objects by photosolidification: US, 4752498 [ P ]. 1988, http://www.google.com/patent.
10Matel Casting, Method and apparatus for production for three-dimensional objects by photosolidification. [ EB/OL]. U.S. DEPARTMENT OF ENERGY. [ 2008 - 4 - 15 ], http://www. oti. doe. gov.