1. Itzykson, C., Kadyshevsky, V. G., and Todorov, I. T., Three Dimensional Formulation of the Relativistic Two-Body Problem and Infinite Component Wave Equations, Institute for Advanced Study, Princeton, preprint (1969) and Phys. Rev. (to be published).
2. Itzykson, C., and Todorov, I. T., “An Algebraic Approach to the Relativistic Two-Body Problem” in Proceedings of the Coral Gables Conference on Fundamental Interactions on High Energy, T. Gudehus et al. editors, Gordon and Breach, New York (1969).
3. Todorov, I. T., “On the Three Dimensional Formulation of the Relativistic Two-Body Problem”, Lectures Presented at the Theoretical Physics Institute, University of Colorado, Boulder (1969).
4. Kadyshevsky, V. G., “Relativistic Equations for the S-Matrix in the p-Representation”, I "Unitarity and Causality Conditions”; II, Soviet Phys. JETP, 19, 443, 597 (1964).
5. Nakanishi, N., “A General Survey of the Theory of the Bethe-Salpeter Equation”, Prog. Theor. Phys. Suppl., No. 43, 1 (1969).