Show stored function code

Hello,
I'm trying to execute search in my stored functions code, but I have some
difficulties. I'm using postgres 9.1.3, and if I execeute this query

SELECT prosrc FROM pg_proc WHERE proname = <function name>;

I retrieve an empty column for all my custom stored functions.

Are I committing some errors?
Is there an alternative way to achieve my goal?

Thanks in advance.

Meph

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