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- [22] NOTE ON FORMULATION OF GAUGE-INVARIANCE CONDITIONS IN S-MATRIX THEORIES NUOVO CIMENTO, 1964, 32 (02): : 317 - +
- [27] GAUGE INVARIANCE AND CURRENT DEFINITION IN QUANTUM ELECTRODYNAMICS PHYSICAL REVIEW, 1966, 151 (04): : 1024 - &
- [29] THEOREM CONCERNING GAUGE INVARIANCE IN QUANTUM ELECTRODYNAMICS PHYSICAL REVIEW, 1967, 155 (05): : 1414 - +