arXiv · hep-ph/9803307
A general pedagogical survey of the basics of the Bethe-Salpeter equation and in particular Wick-Cutkosky model is given in great technical details.
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Z. K. Silagadze. 2009-03-11. Wick-Cutkosky model: an introduction. https://arxiv.org/abs/hep-ph/9803307
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