1. Mentor Graphics: http://www.mentor.com/formalpro/
2. Verplex Systems: http://www.verplex.com/product.html
3. Avant! Corporation: http://www.avanticorp.com/product/1,1172,50,00.html
4. P. Nussbaum, M. Hinners, L. Menevaut, “SimBoy: An Analog Simulator Interface for Automated Datasheet Generation”, Proceedings of the European Design Automation Conference, pp. 37–41, Nov 1994.
5. St. W. Director, P. Feldmann, K. Krishna, “Optimization of Parametric Yield: A Tutorial”, Proceedings of the Custom Integrated Circuits Conference, pp. 3.1.1–3.1.8, Jan 1992.