@BOOK{Pillage,
author="T. L. Pillage and R. A. Rohrer and C. Visweswariah",
title="Electronic Circuit \& System Simulation Methods",
publisher="McGraw-Hill, Inc.",
year=1994,
}

@BOOK{Vlach,
author="J. Vlach and K. Singhal",
title="Computer Methods for Circuit Analysis and Design",
publisher="Van Nostrand Reinhold",
year=1983,
}

@misc{QUCS,
author="S. Jahn and M. Margraf and V. Habchi and R. Jacob",
title="Qucs technical papers",
howpublished = "\url{http://qucs.sourceforge.net/tech/}",
year=2003,
}