1. Hull, C. W., Method for production of 3-D objects by stereolithography. US Patent No. 4,929,402, issued May 29, 1990.
2. Beaman, J. and Deckard, C. R., Selected Laser Sintering with Assisted Power Handling. US Patent No. 4,938,816, issued June 3, 1990.
3. Control parameters and materials selection criteria for rapid prototyping systems;Comb,1993
4. Three dimensional printing;Sachs;J. Eng. Ind.,1992
5. Micropen Technology, Ohmcraft, Inc., Brochure.