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- [5] KINEMATICAL CONSTRAINTS AT T=0 FOR REGULARIZED HELICITY AMPLITUDES - EQUAL-UNEQUAL-MASS CASE [J]. NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS, 1969, 61 (03): : 457 - +
- [7] UNITARITY CONSTRAINTS ON HELICITY AMPLITUDES [J]. LETTERE AL NUOVO CIMENTO, 1972, 4 (14): : 731 - +
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