Francisco V. Fernández Piet Wambacq Georges G. E. Gielen Ángel Rodríguez-Vázquez Willy M. C. Sansen Symbolic Analysis of Large Analog Integrated Circuits by Approximation During Expression Generation. 25-28 1994 ISCAS db/conf/iscas/iscas1994-1.html#FernandezWGRS94