I am looking for some titles. Not looking for basic textbooks nor advanced, I am craving for real stuff. More in detail I would like some book that covers calculus in one variable from a more mature perspective ( such as the one that a phd student should have). Something that may be helpful in technical situation, not a good read, not for pleasure: not the book I deserve but the one I need. It must be a huge pile of tricks and inequalities.
I must say that I am at my last year at uni as a math student, and I have read or at list I am aware of the classics such as Rudin, to make an example. They are great but not quite what I intend here. I don't need ( I hope) to learn about calculus, I need advanced tools, the kind of things that you run into by luck and you keep using ever after.