1. J. H. Bohn,Automatic CAD-Model Repair, UMI, Ann Arbor, MI, USA, 1993.
2. A. Dolenc and I. Makela, ?Leaf: a data exchange format for LMT processes?,Proceedings, Third International Conference on Rapid Prototyping, Dayton, USA, pp. 155?160, 7?10 June 1992.