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Ali, S.T. and Gazeau, J.P. and Karim, M.R. (1996) Frames, the beta-duality in Minkowski space and spin coherent states. Journal of Physics a-Mathematical and General, 29 (17). pp. 5529-5549. ISSN 0305-4470, DOI https://doi.org/10.1088/0305-4470/29/17/024.