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This is a classic book on graph spectra. Its encyclopaedic characteristics and clear exposition on the theory and applications of graph spectra made it widely influential around the world. The third Revised and Enlarged Edition made it more useful since it includes major new advances of graph-spectral theory since the publication of first and second editions in early 1980's.

Not only a favorite of mathematicians who study graph theory, this book is also useful and interesting to other mathematicians, scientists and graduate students in diverse areas of physics, chemistry, and biology, etc.