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3. C. Itzykson and J.B. Zuber: Quantum Field theory. New York: McGraw-Hill 1980 (Chapter 10 gives a review of Bethe-Salpeter equation)
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5. B. Silvestre-Brac, A. Bilal, C. Gignoux, P. Schuck: Phys. Rev. D29, 2275(1984)