From the reviews:

“It is the second volume in a … series of monographs written by Hans Triebel on this topic. … the author introduces different approaches and explains their historic background and motivation in view of applications in a very clear and comprehensible way. … can be recommended as a starting point for scientists who begin to work in this area or just as a brief overview to grasp the key ideas of the theory … .” (Dorothee Haroske, Zentralblatt MATH, Vol. 1235, 2012)