Book on periodic Schrödinger operators I am looking for good books about the spectral theory of periodic (1-dimensional) Schrödinger operators on a compact interval. A good reference I found was Reed/Simon Analysis of Operators (and a book by Eastham on periodic Sturm-Liouville problems). I definitely like this reference, but the problem is that this is really the last chapter of the four books they wrote, so they use a lot of cross references to all other books. Also, I think their style is not the style that I like the most.So, are there more books about this topic available that you could recommend?

Have a look at this book by Gerald Teschl.