any one has these ebooks : The Spice Book, Andrei Vladimirescu, John Wiley & Sons, Inc., 1994, ISBN 0-471-60926-9. PSpice and Circuit Analysis, John Keown, Third Edition, Merrill (Macmillan Publishing Company), 1997, ISBN 0-13-235458-6. PICE2: A Program to Simulate Semiconductor Circuits, Lawrence W. Nagel, Memo UCB/ERL M520, 1975, University of California, Berkeley, CA. Inside SPICE, Ron Keilkowski, McGraw Hill, 1994, ISBN 0-07-913712-1 iam waiting .. ::)