Georges Gielen & Lawrence P. Huelsman 
Symbolic Analysis of Analog Circuits: Techniques and Applications [PDF ebook] 
A Special Issue of Analog Integrated Circuits and Signal Processing

This book brings together important contributions and state-of-the-art research results in the rapidly advancing area of symbolic analysis of analog circuits. It is also of interest to those working in analog CAD. The book is an excellent reference, providing insights into some of the most important issues in the symbolic analysis of analog circuits.