Functional Analysis (Springer Classics in Mathematics): Yosida, Kösaku: 9783540586548: Amazon.com: Books,Nonlinear Functional Analysis and its Applications: III: Variational Methods and Optimization | SpringerLink,Linear Functional Analysis: An Application-Oriented Introduction (Universitext),Applied Nonlinear Functional Analysis: An Introduction (De Gruyter Textbook): Papageorgiou, Nikolaos S., Winkert, Patrick: 9783110516227: Amazon.com: Books,Introduction to Functional Data Analysis with R | R-bloggers,