Posn(R) and Eisenstein Series

From the reviews of the first edition:

"This book treats a family of Dirichlet series in several variables associated with positive definite quadratic forms … . The purpose of the book under review is to give a crisp version of this theory. … all of the necessary reduction theory and harmonic analysis is developed simply and efficiently. Although some of the details are, by nature, intricate, this book reduces these to a minimum and provides an accessible account to this important and beautiful area of mathematics." (Samuel James Patterson, Zentralblatt MATH, Vol. 1076, 2006)