Good resources for learning about recursion [duplicate]

Question

Possible Duplicate:
Resources for improving your comprehension of recursion?

I am a programmer with 2 years experience, and sometimes think I could solve a specific problem with recursion, but in most cases I fail miserably.

I am asking your advice about resources for learning, refreshing and deepening one's knowledge about recursion, preferably:

• helping to identify when you could use recursion.
• practical examples (applied to contemporary programming languages).
• a reference handbook.
• source code.