TITLE: Good reference texts for introduction to partial differential equation?
QUESTION [5 upvotes]: As the title, are there any good reference texts for introduction to partial differential equation?

REPLY [2 votes]: I would recommend "Partial Differential Equations with Fourier Series and Boundary Value Problems" written by Asmar. It is a text for beginners in the subject, but eventually it gets very far, to a thorough treatment of Green's functions. It does also include a lot of material on Bessels functions.