Customize citation style

Question

Is it possible to customize citation styles? I'm not talking about the bibliography, but the appearance of the optional argument in \cite[Theorem $4$]{Pitagora}.

Usually it is rendered as [Pit03, Theorem 4], but one may want to have [Pit03], Theorem 4 or Theorem 4 - [Pit03] or whatever. Does the bibliography style change this?

Answer 1

One way might be something like this.

For your specific example, you could also just define your own command

\newcommand{\mycite}[2]{\cite{#1},~#2}

And then cite it using \mycite{Pitagora}{Theorem~4}. I would not put $ in the reference, since the 4 is not a mathematical formula and should be treated as text.