“A visible feature of the book is its emphasis on the tool and idea development. … The book is particularly beneficial to the following two groups’ of readers: (1) Those who have been working in the direction of PAM or related areas … (2) Young researchers who are considering starting their work in this direction. … Remarks and examples are distributed throughout the entire book with historic accounts and specific discussions, which further increases the readability of the book.” (Xia Chen,Mathematical Reviews, June, 2017)