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- [17] APPROXIMATE SOLUTION OF BETHE-SALPETER EQUATION FOR BOUND STATES NUOVO CIMENTO, 1964, 34 (03): : 791 - +
- [18] APPROXIMATE SOLUTION OF THE BETHE-SALPETER EQUATION FOR 2 FERMIONS PROGRESS OF THEORETICAL PHYSICS, 1961, 25 (02): : 178 - 188