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Michels, M. A. J., & Suttorp, L. G. (1979). Energy shifts and the S matrix in degenerate perturbation theory. Journal of Physics. A, Mathematical and General, 12, 1321-1323. https://doi.org/10.1088/0305-4470/12/8/024
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Suttorp, L. G. (1979). Relativistic bound-state equations for fermions with instantaneous interactions. Annals of Physics, 122, 397-435. https://doi.org/10.1016/0003-4916(79)90208-2
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Ellman, M. J. (1979). Full employment - Lessons from State Socialism. De Economist, 127(4), 489-512. https://doi.org/10.1007/BF02371698
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