The APS online archive page for the following article may be reached by clicking on its DOI:
Asim O. Barut, Ivan Muzinich, and David N. Williams,
"Construction of Invariant Scattering Amplitudes for
Arbitrary Spins and Analytic Continuation in Total Angular
Momentum," Phys. Rev. 130, 442–457 (1963).
Copyright © (1963) by the American Physical Society