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Z97 3	Zwanziger, Daniel     Invariant amplitudes for massless particles and universal electromagnetic coupling [Текст] : lecture notes, to be published in the Proc. of the Symp. on the Lorentz Group, seventh Annual Summer Inst. for Theoretical Physics, Univ. of Colorado, Boulder, Colorado, June 1964 / Centre d'Etudes Nucleaires de Saclay Service de Physique Theorique. B. P. N 2 - Gif-sur-Yvette (S. O) - France. — [Boulder (Colorado) ?] : [s. n.], 1964. — 63 p., [3] p. ill.