MathSciNet bibliographic data MR273921 (42 #8797) 81.22 Macfadyen, N. W.; Winternitz, P. Crossing symmetric expansions of physical scattering amplitudes: the ${\rm O}(2,\,1)$${\rm O}(2,\,1)$ group and Lamé functions. J. Mathematical Phys. 12 1971 281–293. Article

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