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## Main Question or Discussion Point

Can anybody recommend a good review article (or a book) for bound state calculations in QFT? I have never seen anything along these lines, other than brief sections or paragraphs in various textbooks about the connection to the Schrodinger equation in the non-relativistic limit for two particle systems. Even if the fully relativistic treatment is difficult (or even impossible) to carry out numerical calculations with, I would like to see at least a well developed formalism that sets up the problem and analyzes it in great detail.